Servers with perfect hair (10)

I believe the answer is:

waitresses

'servers' is the definition.
(I know this)

'with perfect hair' is the wordplay.
'with' becomes 'w' (short for with).
'perfect' becomes 'ai' (resembles A1, informal term meaning excellent).
'hair' becomes 'tresses' (tresses are locks of hair).
'w'+'ai'+'tresses'='WAITRESSES'

I've seen this clue in The Guardian.

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