Put to use (5)
'put to use' is the definition.
(exerting is a kind of putting to use)
This is the entire clue.
(Other definitions for exert that I've seen before include "Work very hard" , "Wield - apply" , "Apply (force)" , "Make use of" , "Bring into use, strength or influence" .)
'put to use' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for apply that I've seen before include "Make a formal request (to someone); put on" , "Administer" , "Send off (form, etc)" , "describing the cooker?" , "Ask (for job)" .)
(Other definitions for harness that I've seen before include "Couple" , "riding equipment" , "Gear for a horse" , "Set of straps for horse or child" , "Exploit (something's) potential energy" .)
'put to use' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for applied that I've seen before include "Put into practice or requested" , "Employed" , "Practical rather than theoretical" , "Put oneself forward, for a job say" , "Put into service, made work" .)
'put to use' is the definition.
(synonyms)
This is all the clue.
(Other definitions for utilize that I've seen before include "In use" , "Appropriate" .)