Woman all set to change (6)
I believe the answer is:
stella
'woman' is the definition.
'all set to change' is the wordplay.
'to change' indicates an anagram.
'all'+'set'='allset'
'allset' anagrammed gives 'STELLA'.
(Other definitions for stella that I've seen before include "- Gibbons (Cold Comfort Farm)" , "Swift alias for Esther" , "girl!" , "____ McCartney, fashion designer" , "woman" .)