England captain formerly on reduced grub (6)

I believe the answer is:

rootle

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

'grub' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for rootle that I've seen before include "Dig with snout" , "Dig (as pig for truffles)" , "grub" , "Search the ground as pigs do" .)

I've seen this clue in The Guardian.

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