Crossword Genius

Meat sandwich sent back: not on for nosh? (4)

Ross

I believe the answer is:

grub

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'for nosh?' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for grub that I've seen before include "Caterpillar - food" , "ferret > eats" , "Dig - maggot - food" , "Nosh - larva" , "Eats - larva" .)

I've seen this clue in The Sun and The Times.
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