President's top suit (5)
I believe the answer is:
trump
This could be a double definition.
'president's' is the first definition.
(Donald Trump)
'top suit' is the second definition.
'trump' can be an answer for 'top' (both can mean to beat or outdo). I am not sure about the 'suit' bit.
Can you help me to learn more?
(Other definitions for trump that I've seen before include "Valuable card" , "Card of the most powerful suit" , "Brick" , "Ruff at cards" , "High-ranking card" .)