Drop out, in poker (4)
I believe the answer is:
fold
'drop out in poker' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for fold that I've seen before include "Church following" , "Bend over; pen" , "Sheep pen; disintegrate" , "go bankrupt, perhaps" , "Pleat; sheep pen" .)