The old girls now crazy about me (5)
I believe the answer is:
women
'the old girls' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps you can see a link between them that I can't see?
'now crazy about me' is the wordplay.
'crazy' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'now' anagrammed gives 'won'.
'won' placed around 'me' is 'WOMEN'.
Can you help me to learn more?
(Other definitions for women that I've seen before include "Adult human females" , "half of our race" , "Ladies" .)