Girl turning lilac (5)

I believe the answer is:

cilla

'girl' is the definition.
(woman's name)

'turning lilac' is the wordplay.
'turning' is an anagram indicator.
'lilac' is an anagram of 'CILLA'.

(Other definitions for cilla that I've seen before include "Colourful old singer" , "- Black, TV personality and singer" .)

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