Men work on time, needing a snack (8)
I believe the answer is:
tortilla
'snack' is the definition.
(I know that tortilla is a type of snack)
'men work on time needing a' is the wordplay.
I cannot quite understand how this works, but
'men' could be 'or' (Other Ranks: non-commissioned soldiers) and 'or' is located in the answer.
'work' could be 'till' (to till is to work the land) and 'till' is located in the answer.
'time' could be 't' (abbreviation) and 't' is found in the answer.
'a' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tortilla that I've seen before include "Mexican corn-meal pancake" , "Mexican flatbread" , "Mexican dish" , "Thin Mexican corn cake" , "Mexican snack" .)