Slav fouled: ball burst (5)
I believe the answer is:
salvo
'burst' is the definition.
(I know that salvo is a type of burst)
'slav fouled ball' is the wordplay.
'fouled' indicates anagramming the letters.
'ball' becomes 'o' (O looks like a ball).
'slav' is an anagram of 'salv'.
'salv'+'o'='SALVO'
(Other definitions for salvo that I've seen before include "Simultaneous discharge of guns" , "Ceremonial shots" , "A simultaneous salute of guns" , "Ceremonial round of gunfire" , "Simultaneous firing of weapons" .)