The fashionable sound (5)

I believe the answer is:

swish

This clue is a double definition.

'the fashionable' is the first definition.
(thesaurus)

'sound' is the second definition.
(swish is a kind of sound)

(Other definitions for swish that I've seen before include "Elegant" , "Smart; stylish" , "Classy" , "Impressively smart" , "Stylish (sl.)" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app