Crossword Genius

In small volume (4-4)

Ross

I believe the answer is:

half-pint

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

'in small' is the definition.
'half pint' can be an answer for 'small' (thesaurus). I'm not certain of the 'in' bit.

'volume' is the wordplay.
I cannot really see how this works, but
'volume' could be 'pint' and 'pint' is present in the answer.
The remaining letters 'half' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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