Dance fantastic on gala shows (5)
I believe the answer is:
conga
'dance' is the definition.
(I've seen this before)
'fantastic on gala shows' is the wordplay.
'shows' indicates a hidden word.
'CONGA' is hidden in the letters of 'fantastic on gala'.
(Other definitions for conga that I've seen before include "Serpentine dance" , "Line-dancing" , "wiggling line" , "Circuitous line dance" , "Chain dance" .)