We hear the swindler is a fast mover (7)

I believe the answer is:

cheetah

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'fast mover' is the definition.
(cheetahs move fast)

I don't understand how the rest of the clue works.

(Other definitions for cheetah that I've seen before include "Fast spotted wildcat - sounds dishonest" , "Cat renowned for speed" , "Very fast mammal" , "Fast predator" , "Long-legged spotted big cat" .)

I've seen this clue in The Irish Independent.

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