Poet heading off for snacks (4)
I believe the answer is:
eats
'snacks' is the definition.
(I've seen this before)
'poet heading off' is the wordplay.
'poet' becomes 'yeats' (Yeats is an example).
'heading off' means to remove the first letter.
'yeats' with its first letter removed is 'EATS'.
'for' is the link.
(Other definitions for eats that I've seen before include "fare" , "Food (informal)" , "Victuals" , "Is not any faster" , "corrodes" .)