Assembly workers eating the last of their fried food (8)
I believe the answer is:
fritters
'fried food' is the definition.
'assembly workers eating the last of their' is the wordplay.
'assembly workers' becomes 'fitters' (people who fit or assemble things).
'eating' means one lot of letters goes inside another.
'the last of' says to take the final letters.
The final letter of 'their' is 'r'.
'fitters' placed around 'r' is 'FRITTERS'.
(Other definitions for fritters that I've seen before include "Squanders the fruit fried in batter" , "battered apples, for instance" , "Wastes" , "food" .)