Your label changed colour (5,4)
I believe the answer is:
royal blue
'colour' is the definition.
(royal blue is a kind of colour)
'your label changed' is the wordplay.
'changed' is an anagram indicator.
'your'+'label'='yourlabel'
'yourlabel' with letters rearranged gives 'ROYAL BLUE'.
(Other definitions for royal blue that I've seen before include "Deep rich shade of colour" , "Your be-all (anag) - shade" , "Bally euro (anag.)" , "Dark colour" , "A shade Conservative" .)