Bridge player's joke, pocketing ace and hiding jack (4)
I believe the answer is:
east
'bridge player's' is the definition.
(name given to one player in the card game bridge)
'joke pocketing ace and hiding jack' is the wordplay.
I cannot really understand how this works, but
'ace' could be 'a' (abbreviation) and 'a' is found in the answer.
The remaining letters 'est' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for east that I've seen before include "Asia" , "E" , "Cardinal compass point" , "Direction of the rising sun" , "One regularly holding hands" .)