Chump
'chump' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for dolt that I've seen before include "Dullard" , "Blockhead" , "Stupid person" , "Idiot" , "dope" .)
(Other definitions for dope that I've seen before include "Fool - model aeroplane varnish" , "cheat thereat?" , "Informally, drug or silly person" , "The idiot's a drug" , "Illegal drug; idiot" .)
'chump' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ass that I've seen before include "One in Bible spoke" , "Moke" , "Small hoofed animal" , "oaf" , "A donkey or an idiot" .)
'chump' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sap that I've seen before include "Enfeeble" , "Vital plant juice" , "Insidiously undermine" , "Cosh; plant's juice" , "Charlie" .)
'chump' is the definition.
(I know that chump can be written as sucker)
This is the entire clue.
(Other definitions for sucker that I've seen before include "Slangy victim or sort of adherent" , "Gullible person; plant shoot" , "Shoot from underground stem, or slangy victim" , "baby?" , "Shoot from plant roots or informal victim" .)
(Other definitions for nincompoop that I've seen before include "dunce" , "Foolish person" , "jerk" , "Silly-billy" , "Fool" .)
(Other definitions for muttonhead that I've seen before include "Fool" , "idiot!" .)