We backed out of the wrong crowd (6)

I believe the answer is:

throng

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'crowd' is the definition.
(thronging is a kind of crowding)

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

(Other definitions for throng that I've seen before include "A great crowd of people" , "A large crowd of people" , "Dense crowd" , "Come in great numbers" , "Large crowd or host" .)

I've seen this clue in The Guardian.

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