Put forward case to eat some on vacation (5)
I believe the answer is:
posed
'put forward' is the definition.
(I've seen this in another clue)
'case to eat some on vacation' is the wordplay.
'case' becomes 'pod' (pod is a kind of case).
'to eat' is an insertion indicator.
'on vacation' suggests removing the centre (after the inside letters have vacated the word).
'some' with its middle taken out is 'se'.
'pod' placed around 'se' is 'POSED'.
(Other definitions for posed that I've seen before include "Positioned" , "Struck attitude, perhaps for painter" , "Presented (a question)" , "Was a model" , "Modelled" .)