Phil can be said to eat his (4)

I believe the answer is:

fill

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'phil can' is the definition.
'fill' can be an answer for 'can' (thesaurus). I am not sure about the 'phil' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for fill that I've seen before include "Top up" , "Repair tooth" , "Plug (a gap)" , "` `Work expands to .... the time available' '" , "Satisfy (a need)" .)

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