Can red upset the ballerina? (6)
I believe the answer is:
dancer
'the ballerina?' is the definition.
(ballerina is a kind of dancer)
'can red upset' is the wordplay.
'upset' is an anagram indicator.
'can'+'red'='canred'
'canred' with letters rearranged gives 'DANCER'.
(Other definitions for dancer that I've seen before include "''I hope you have the feet of a ...'' (Charlie McGettigan)" , "One of Santa's reindeer" , "behind Rudolph" , "Ballerina or chorus girl?" , "Terpsichorean" .)