A foxy dig? (6)

I believe the answer is:

burrow

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'dig?' is the definition.
(I know that burrow is a more specific form of dig)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for burrow that I've seen before include "Animal's excavation" , "A rabbit's tunnel" , "Warren" , "Tunnel made by rabbit" , "Rabbit's home" .)

I've seen this clue in the Evening Standard.

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