Crossword Genius

Like a mole, for example, eating his grub? (13)

Ross

I believe the answer is:

insectivorous

I'm a little stuck... Click here to teach me more about this clue!

'eating his grub?' is the definition.
'insectivorous' can be an answer for 'eating' (thesaurus). I am not sure about the 'his grub?' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for insectivorous that I've seen before include "Like, eg, anteaters" , "Eating bugs" , "Enjoying, for example, cricket" , "Having a diet of ants etc" .)

I've seen this clue in The Times.
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