Doesn't drink much (4)

I believe the answer is:

sips

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'doesn't drink much' is the definition.
I can't judge whether this defines the answer.

'drink much' is the wordplay.
'drink' becomes 'sip' (sipping is a kind of drinking).
'much' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'sip'+'s'='SIPS'

Can you help me to learn more?

(Other definitions for sips that I've seen before include "Drinks slowly" , "Takes small mouthfuls" .)

I've seen this clue in the Evening Standard and The New York Times.

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