Pro not playing now (6)
I believe the answer is:
pronto
'now' is the definition.
(I've seen this in another clue)
'pro not playing' is the wordplay.
'playing' indicates an anagram.
'not' anagrammed gives 'nto'.
'pro'+'nto'='PRONTO'
(Other definitions for pronto that I've seen before include "Promptly, without delay" , "Quickly, amigo" , "Immediately, amigo" , "Proton (anag.)" , "Quickly (sl.)" .)