Caught in endless crooked dealing (6)
I believe the answer is:
nailed
'caught' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for nailed that I've seen before include "Denial (anag.)" , "Secured" , "Fixed with metal spikes" , "Tacked" , "Exposed" .)