Food for a young insect (4)

I believe the answer is:

grub

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This could be a double definition.

'food' is the first definition.
(grub can informally mean food)

'young insect' is the second definition.
'grub' can be an answer for 'insect' (a grub is an insect larva). I'm unsure of the 'young' bit.

'for a' is the link.

Can you help me to learn more?

(Other definitions for grub that I've seen before include "Larva; food (sl.)" , "Dig (up); hack writers' Street" , "Eats - larva" , "Slang food for worm-like larva" , "ferret > eats" .)

I've seen this clue in The Globe and Mail.

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