Hotshots, ones in suits (4)
I believe the answer is:
aces
This clue is a double definition.
'hotshots' is the first definition.
('ace' can be a synonym of 'hotshot')
'ones in suits' is the second definition.
(cards in playing card suits)
(Other definitions for aces that I've seen before include "Expert fliers" , "Champions" , "Winning serves" , "Top cards or people" , "Ones or elevens in cards" .)