Setter in do Harry gets drunk with a sip (9)

I believe the answer is:

hairspray

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

'setter in do' is the definition.
'hairspray' can be an answer for 'setter' (I've seen this before). I'm not certain of the 'in do' bit.

'harry gets drunk with a sip' is the wordplay.
'gets drunk with' indicates an anagram.
'a'+'sip'='asip'
'harry' with its letters anagrammed with 'asip' gives 'HAIRSPRAY'.

Can you help me to learn more?

(Other definitions for hairspray that I've seen before include "Barnet manager" , "fine solution" , "pressurised stuff?" , "setter" .)

I've seen this clue in The Independent.

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