Asleep when roused in delight (6)
I believe the answer is:
please
'delight' is the definition.
(I know that delight is a kind of delight)
'asleep when roused' is the wordplay.
'when roused' indicates anagramming the letters.
'asleep' anagrammed gives 'PLEASE'.
'in' acts as a link.
(Other definitions for please that I've seen before include "Asleep (anag)" , "Give satisfaction to" , "Make glad, being asleep" , "Give happiness" , "Satisfy or gratify" .)