Respond concerning part of play (5)

I believe the answer is:

react

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

'concerning part of play' is the wordplay.
'concerning' becomes 're'.
'part of play' becomes 'act' ('act' is part of 'play').
're'+'act'='REACT'

(Other definitions for react that I've seen before include "Retaliate" , "Respond to something" , "provide an answer" , "Hit back" , "Acknowledge" .)

I've seen this clue in The Mirror, The Telegraph and The Times.

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