A girl Rachel ordered around too much (9)
I believe the answer is:
charlotte
'a girl' is the definition.
(girl's name)
'rachel ordered around too much' is the wordplay.
'ordered' is an anagram indicator.
'around' means one lot of letters goes inside another.
'too much' becomes 'OTT' (short for over the top).
'rachel' anagrammed gives 'charle'.
'charle' enclosing 'ott' is 'CHARLOTTE'.
(Other definitions for charlotte that I've seen before include "Pudding; girl" , "sort of sweet" , "associated with the Web?" , "Dessert" , "Victorian novelist" .)