Volley in Oval's out of place! (5)
I believe the answer is:
'volley' is the definition.
(I've seen this before)
'oval's out of place' is the wordplay.
'out of place' indicates an anagram.
'ovals' with letters rearranged gives 'SALVO'.
'in' acts as a link.
(Other definitions for salvo that I've seen before include "Simultaneous discharge of artillery" , "A volley of shots, perhaps as salute" , "Broadside" , "A simultaneous salute of guns" , "Burst (of applause, insults, artillery etc)" .)