Colourful part of the Sabre Dance
I believe the answer is:
red
'colourful' is the definition.
(similar in meaning)
'part of the sabre dance' is the wordplay.
'part of' indicates a hidden word.
'RED' is hidden within 'sabre dance'.
(Other definitions for red that I've seen before include "The colour of the former Russian army" , "Florid" , "Blood-coloured" , "Looking embarrassed" , "Colour for danger" .)