Winning card and losing president (5)
I believe the answer is:
trump
This clue could be a double definition.
'winning card' is the first definition.
(e.g. in bridge or whist)
'losing president' is the second definition.
'trump' can be an answer for 'president' (Donald Trump). I am not certain of the 'losing' bit.
'and' is the link.
Can you help me to learn more?
(Other definitions for trump that I've seen before include "Playing card with designated added value" , "Reliable type" , "Powerful card - the last one to be heard at the Day of Judgement" , "Outplay" , "Card of designated top suit" .)