Supple adults content to beg (5)
I believe the answer is:
plead
'to beg' is the definition.
(I've seen this in another clue)
'supple adults content' is the wordplay.
'content' says the answer is hidden in the clue (letters contained within the clue).
'PLEAD' can be found hidden inside 'supple adults'.
(Other definitions for plead that I've seen before include "Present an argument in court" , "State whether one is guilty or not" , "Argue (a position in court)" , "Request" , "advocate in court" .)