Crossword Genius

Eel caught in drum (5)

Ross

I believe the answer is:

conga

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'drum' is the definition.
(thesaurus)

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

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(Other definitions for conga that I've seen before include "wiggling line" , "Single-file dance" , "Lined-up dance" , "Latin American dance with three steps and a kick" , "Dance performed in line" .)

I've seen this clue in The Guardian.
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