Small Oval ground producing such an outburst (5)
I believe the answer is:
salvo
'such an outburst' is the definition.
(a salvo is a loud display of gunshots)
'small oval ground' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'ground' is an anagram indicator (grind the letters ).
'oval' anagrammed gives 'alvo'.
's'+'alvo'='SALVO'
'producing' acts as a link.
(Other definitions for salvo that I've seen before include "Series of shots" , "Sudden round of applause" , "What comes across" , "Discharge of weapons in unison" , "Fiery outburst" .)