Emperor once gambling with cards, said flier? (9)
I believe the answer is:
'emperor' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for montezuma that I've seen before include "stomach-turning revenge" , "Old American leader" , "Aztec emperor (who takes his revenge on tourists?)" , "Aztec "revenge" ruler" , "Last Aztec emperor (who now has his revenge!)" .)