Doolittle of "My Fair Lady" (5)
I believe the answer is:
eliza
'doolittle of my fair lady' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eliza that I've seen before include "Henry Higgins' protege (My Fair Lady)" , "girl" , "woman" , "- Doolittle (Pygmalion)" , "Miss Doolittle" .)