Cilla changes colour (5)

I believe the answer is:

lilac

'colour' is the definition.
(lilac is a shade of purple)

'cilla changes' is the wordplay.
'changes' indicates an anagram.
'cilla' is an anagram of 'LILAC'.

(Other definitions for lilac that I've seen before include "Pale pinkish-violet" , "Drop by about one, turning" , "Pale purple - flowering tree" , "Flower celebrated by Schubert" , "Tree - pinkish-purple colour" .)

I've seen this clue in the Evening Standard.

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