Love it to change colour (6)
I believe the answer is:
violet
'colour' is the definition.
(violet is a kind of colour)
'love it to change' is the wordplay.
'to change' indicates anagramming the letters.
'love'+'it'='loveit'
'loveit' with letters rearranged gives 'VIOLET'.
(Other definitions for violet that I've seen before include "Bluish-purple colour as of pretty flower" , "See 9" , "Reddish blue colour" , "Colour; flower, source of fragrance" , "Flower-girl" .)