Son eating a small slice (7)

I believe the answer is:

shaving

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'slice' is the definition.
(I have seen 'Thin slice ' mean 'shaving' so perhaps 'slice' could also mean 'shaving')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for shaving that I've seen before include "Thin slice" , "Cutting with a razor or slicing very thin" .)

I've seen this clue in The Hindu.

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