Eel caught in drum (5)
I believe the answer is:
conga
'drum' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(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" .)