Crossword Genius

Behave concerning performance (5)

Ross

I believe the answer is:

react

'behave' is the definition.
(thesaurus)

'concerning performance' is the wordplay.
'concerning' becomes 're'.
'performance' becomes 'act' (act is a kind of performance**).
're'+'act'='REACT'

(Other definitions for react that I've seen before include "Behave in response" , "Act as opponent" , "Respond to something" , "Trace (anag)" , "What a chemical might do" .)

I've seen this clue in The Mirror.
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