Crossword Genius

Become fashionable (5,2)

Ross

I believe the answer is:

catch on

'become fashionable' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for catch on that I've seen before include "twig" , "Informally, become popular or come to understand" , "Understand - become fashionable" , "Get it" .)

I've seen this clue in The Times.
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