How Donald wins a trick? (6)
I believe the answer is:
'wins a trick?' is the definition.
The definition and answer can be both related to competing as well as being verbs in their -s form.
Perhaps you can see an association between them that I don't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for trumps that I've seen before include "Outdoes" , "These cards will win" , "Playing cards temporarily ranked above others" , "Highest-ranking suit" , "Cards designated as having added value in game" .)