Italian scorer's second offence in Ireland (7)
I believe the answer is:
rossini
'italian scorer's' is the definition.
(I've seen this before)
'second offence in ireland' is the wordplay.
'second' becomes 's' (common abbreviation).
'offence' becomes 'sin' (I've seen this before).
'in' is an insertion indicator.
'ireland' becomes 'roi' (Republic of Ireland).
's'+'sin'='ssin'
'ssin' going within 'roi' is 'ROSSINI'.
(Other definitions for rossini that I've seen before include "Italian opera composer" , "opera producer" , "Italian scorer" , "Composer of 'The Barber of Seville' and 'William Tell'" , "Gioacchino ---, It. composer" .)