Dance in a line (5)
I believe the answer is:
conga
'dance in a line' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for conga that I've seen before include "Line-dancing" , "wiggling line" , "Latin American dance with three steps and a kick" , "Lined-up dance" , "Snaking Latin American dance" .)