Insect food (4)

I believe the answer is:

grub

I believe this clue is a double definition.

'insect' is the first definition.
(a grub is an insect larva)

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

(Other definitions for grub that I've seen before include "Nosh - larva" , "Larva; dig shallowly" , "ferret > eats" , "Dig (up); hack writers' Street" , "Insect larva or slang food (4)" .)

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

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