Criticise for going back to sleep (3)
I believe the answer is:
pan
'criticise' is the definition.
(informal term meaning to criticise heavily)
'going back to sleep' is the wordplay.
'going back' says the letters should be written backwards.
'to sleep' becomes 'nap' (napping is a kind of sleeping).
'nap' written backwards gives 'PAN'.
'for' acts as a link.
(Other definitions for pan that I've seen before include "piece in the kitchen" , "Skillet" , "Criticise - cooking vessel" , "Woodland god with merry merry pipes" , "'Mythical god, half man, half goat (3)'" .)