Substitute (4)
'substitute' is the definition.
(synonyms)
This is all the clue.
(Other definitions for ersatz that I've seen before include "Artificial, imitation - from German" , "Mock" , "Inferior substitute" , "Artificial or inferior imitation" , "Not real or genuine" .)
'substitute' is the definition.
(both can mean someone who stands in for another)
This is the entire clue.
(Other definitions for deputy that I've seen before include "Member of the French parliament" , "Appointed representative for another" , "One given the power to act for another" , "number two" , "US sheriff's assistant" .)
'substitute' is the definition.
(synonyms)
This is all the clue.
(Another definition for stand-in that I've seen is " Substitute".)
'substitute' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for swap that I've seen before include "Change over" , "Exchange goods" , "Exchange, barter" , "Switch" , "Exchange; hands back" .)
'substitute' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for vice that I've seen before include "Tool with gripping jaws" , "Workshop tool - bad habit" , "Gripper - depravity" , "Bad habits" , "Gripper - sin" .)
'substitute' is the definition.
(replacement is a kind of substitute)
This is the entire clue.
(Other definitions for replacement that I've seen before include "sub" , "A substitute item" , "One superseding another" , "Restoration - substitution" , "change" .)
'substitute' is the definition.
(surrogate is a kind of substitute)
This is the entire clue.
(Other definitions for surrogate that I've seen before include "Argues about rot with substitute or deputy" , "stand-in" , "One standing in" , "Deputising substitute" , "(A) substitute in office" .)
'substitute' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for replace that I've seen before include "Put something back where it belongs" , "Put back or substitute" , "Substitute for (someone)" , "succeed" , "Provide a substitute for" .)
'substitute' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for reserve that I've seen before include "Keep for someone - spare bod" , "Husband - substitute" , "Book - spare player" , "Hold back" , "man on bench?" .)
'substitute' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for standby that I've seen before include "Item or person ready for use in emergency" , "reserve" .)
'substitute' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for fill in that I've seen before include "Deputise - complete form" , "Brief" , "Occupy (time)" , "'Act as temporary substitute (4,2)'" , "point between courses" .)