Portuguese saint riddled with 55 shots (5)
I believe the answer is:
salvo
'shots' is the definition.
(I've seen this before)
'portuguese saint riddled with 55' is the wordplay.
'portuguese saint' becomes 'sao' ('saint' in Portuguese).
'riddled with' is an insertion indicator (to be riddled with something is to be full of it).
'55' becomes 'lv' (Roman numerals).
'sao' going around 'lv' is 'SALVO'.
(Other definitions for salvo that I've seen before include "Burst (of applause, insults, artillery etc)" , "Ceremonial round of gunfire" , "Rapid simultaneous shooting" , "Simultaneous discharge of guns" , "Fusillade, volley" .)