Share a new doctor - French one didn't hang around (3,3,3)
I believe the answer is:
cut and run
'didn't hang around' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'share a new doctor french one' is the wordplay.
'share' becomes 'cut' (cut is a kind of share).
'a' becomes 'an'.
'new doctor french' becomes 'dr' (I can't explain this - if you can you should believe this answer much more).
'one' becomes 'un' (northern English dialect form of 'one').
'cut'+'an'+'dr'+'un'='CUT AND RUN'
Can you help me to learn more?
(Other definitions for cut and run that I've seen before include "get away quickly" , "light out" , "Escape quickly from a difficult situation" , "A batsman may" , "How to deal with short ball" .)