Female succeeding Queen's lackey (9)
I believe the answer is:
flatterer
'lackey' is the definition.
(thesaurus)
'female succeeding queen's' is the wordplay.
'female' becomes 'f' (common abbreviation).
'succeeding' becomes 'latter' (as in subsequent or following).
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'f'+'latter'+'er'='FLATTERER'
(Other definitions for flatterer that I've seen before include "Person who imitates, perhaps" , "Sycophant" , "One uses butter" .)