Fool may be taken at bridge (5)
I believe the answer is:
trick
'fool' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for trick that I've seen before include "Hoax; knack" , "Round of cards; prank" , "made with finesse, perhaps" , "Illusion; artifice" , "Con" .)