Supervisor of love poetry to queen (8)
I believe the answer is:
overseer
'supervisor' is the definition.
(an overseer supervises others)
'love poetry to queen' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'poetry' becomes 'verse' (synonyms).
'to queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'o'+'verse'+'er'='OVERSEER'
'of' acts as a link.
(Other definitions for overseer that I've seen before include "One manages" , "'Supervisor, chargehand (8)'" , "monitor" , "who is put in charge" , "Person supervising" .)