Short river seen before a dance (5)

I believe the answer is:

conga

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'dance' is the definition.
(conga is a type of dance)

I can't explain the rest of the clue.

(Other definitions for conga that I've seen before include "Latin American dance with three steps and a kick" , "Lined-up dance" , "Serpentine dance" , "Party dance" , "Dance of 3 steps and a kick by people in single file" .)

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