Re-engage, presumably, after finally playing volley? (7)
I believe the answer is:
gunfire
'volley?' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for gunfire that I've seen before include "Reports" , "Weaponry noise" , "Repeated shooting" , "Sound of shots" , "Fine rug (anag.)" .)