Hunger for end of supper in grotto (5)
I believe the answer is:
crave
'hunger for' is the definition.
(I've seen this before)
'end of supper in grotto' is the wordplay.
'end of' suggests the final letters.
'in' is an insertion indicator.
'grotto' becomes 'cave' (I've seen this before).
The final letter of 'supper' is 'r'.
'r' put within 'cave' is 'CRAVE'.
(Other definitions for crave that I've seen before include "Desperately desire" , "Have strong urge" , "Really want" , "Have strong desire for, or beg as for mercy" , "Beg; long for" .)