Food item is produced by bachelor in hat (10)
I believe the answer is:
comestible
'food item' is the definition.
(comestible means an item of food)
'is produced by bachelor in hat' is the wordplay.
'is produced by' becomes 'comes' (a product comes from a particular process).
'bachelor' becomes 'b' (abbreviation e.g. BA=Bachelor of Arts).
'in' indicates putting letters inside.
'hat' becomes 'tile' (I've seen this before).
'b' placed inside 'tile' is 'tible'.
'comes'+'tible'='COMESTIBLE'
(Other definitions for comestible that I've seen before include "Food item" , "Good to put away" , "Edible" .)