Virtuosi - cards (4)
I believe the answer is:
aces
This clue is a double definition.
'virtuosi' is the first definition.
('ace' can be a synonym of 'virtuoso')
'cards' is the second definition.
(ace is a kind of card)
(Other definitions for aces that I've seen before include "excellent service" , "holes in one" , "Two will make deuce" , "Champions" , "passes with flying colours in US" .)