Crossword Genius

Some icon of fashion not constant (2-3)

Ross

I believe the answer is:

on-off

'not constant' is the definition.
(on-off can mean irregular or sporadic)

'some icon of fashion' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'ON-OFF' can be found hidden inside 'icon of fashion'.

(Other definitions for on-off that I've seen before include "in bursts" , "Discontinuous" .)

I've seen this clue in The Times.
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