Small, oval-shaped shots (5)
I believe the answer is:
salvo
'shots' is the definition.
(I've seen this before)
'small oval-shaped' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'shaped' indicates anagramming the letters.
'oval' with letters rearranged gives 'alvo'.
's'+'alvo'='SALVO'
(Other definitions for salvo that I've seen before include "Burst of artillery shots" , "Fusillade, volley" , "Simultaneous discharge of fire" , "Unusual excuse" , "Simultaneous discharge of guns" .)