Completely unwarranted eating crew ration (9)
I believe the answer is:
allotment
'ration' is the definition.
(I've seen this in another clue)
'completely unwarranted eating crew' is the wordplay.
'completely' becomes 'all' (synonyms).
'unwarranted' becomes 'OTT' (over the top).
'eating' indicates putting letters inside.
'crew' becomes 'men' (I've seen this before).
'ott' going around 'men' is 'otment'.
'all'+'otment'='ALLOTMENT'
(Other definitions for allotment that I've seen before include "growing area?" , "Plot of land rented for growing vegetables" , "Rented piece of ground" , "Where vegetables may be produced" , "Vegetable plot" .)