Crossword Genius

Drink to small hairpiece (4)

Ross

I believe the answer is:

swig

'drink to' is the definition.
(thesaurus)

'small hairpiece' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'hairpiece' becomes 'wig' (wig is a kind of hairpiece).
's'+'wig'='SWIG'

(Other definitions for swig that I've seen before include "Large swallow" , "Swallow (drink) greedily" , "(Take) quick drink from bottle" , "Large draught of drink" , "Drink (a deep draught)" .)

I've seen this clue in The Mirror.
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