Card player swivelling on crutch occasionally (5)
I believe the answer is:
north
'card player' is the definition.
(bridge players are known by compass position)
'swivelling on crutch occasionally' is the wordplay.
'swivelling on' becomes 'no' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'occasionally' indicates alternate letters (letters taken at regular intervals or occasions).
The alternate letters of 'crutch' are 'rth'.
'no'+'rth'='NORTH'
Can you help me to learn more?
(Other definitions for north that I've seen before include "Magnetic or true?" , "British leader" , "Former statesman" , "Boreas was the god of the - wind" , "Direction that's usually "up" on a map" .)