Crossword Genius

Proverbially smooth advocate? (4)

Ross

I believe the answer is:

silk

This clue is a double definition.

'proverbially smooth' is the first definition.
(ref to the phrase 'smooth as silk')

'advocate?' is the second definition.
(silk is an informal term for a lawyer)

(Other definitions for silk that I've seen before include "Fabric obtained from the cocoon of a worm" , "Soft lustrous fabric" , "Fibre of cocoons" , "Ancient double-oared ship could be mire" , "Rich fabric" .)

I've seen this clue in The Times.
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