Crossword Genius

Go on instinct, improvise (4,2,2,3)

Ross

I believe the answer is:

play it by ear

(Other definitions for play it by ear that I've seen before include "Proceed without advance planning" , "do what circumstances dictate" , "Improvise action as necessary" , "Can't read music? Then improvise!" , "Extemporise" .)

I've seen this clue in The Times.
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