Root out food (4)

I believe the answer is:

grub

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This could be a double definition.

'root out' is the first definition.
'grub' can be an answer for 'root' (thesaurus). I am not certain of the 'out' bit.

'food' is the second definition.
(grub is a kind of food)

Can you help me to learn more?

(Other definitions for grub that I've seen before include "Dig - maggot - food" , "ferret > eats" , "Food (informal)" , "Nosh - larva" , "Slang food for worm-like larva" .)

I've seen this clue in The Telegraph.

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