Little sister goes round quietly and has a short drink (4)

I believe the answer is:

sips

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'has a short drink' is the definition.
I can't tell whether this definition defines the answer.

'little sister goes round quietly' is the wordplay.
'little sister' becomes 'sis' (synonyms. I am not sure about the 'little' bit.).
'goes round' indicates putting letters inside.
'quietly' becomes 'p' (p for piano and quiet).
'sis' placed around 'p' is 'SIPS'.

'and' acts as a link.

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 Sydney Morning Herald.

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