Apply, as effort (5)
I believe the answer is:
exert
(Other definitions for exert that I've seen before include "Bring into use, strength or influence" , "Bring into use, say strength" , "Bring into play, wield" , "Employ" , "Wield - apply" .)
I believe the answer is:
exert
(Other definitions for exert that I've seen before include "Bring into use, strength or influence" , "Bring into use, say strength" , "Bring into play, wield" , "Employ" , "Wield - apply" .)