Yield when discharged (6)
I believe the answer is:
assent
'yield' is the definition.
(I've seen this in another clue)
'when discharged' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'discharged' becomes 'sent' (I've seen this in another clue).
'as'+'sent'='ASSENT'
(Other definitions for assent that I've seen before include "Express approval or agreement" , "Permission" , "Agreement (to a proposal)" , "Say yes" , "Agree - concede" .)