Feature of poker: not bent (8)
I believe the answer is:
straight
I believe this is a double definition.
'feature of poker' is the first definition.
(sequence of cards in poker)
'not bent' is the second definition.
(bent can mean crooked or not straight)
(Other definitions for straight that I've seen before include "Without deviations or curves" , "Respectable" , "Linear" , "Instantly - honest" , "Honest, not crooked" .)