Girl discovered in brothel, enamoured (6)
I believe the answer is:
helena
'girl' is the definition.
'discovered in brothel enamoured' is the wordplay.
'discovered' indicates a hidden word (remove the letters covering the answer in the clue).
'HELENA' is hidden in the letters of 'in brothel enamoured'.
(Other definitions for helena that I've seen before include "Girl's name - US state capital" , "character 8 [OF SHAKESPEARE]" , "Hermia's friend, rival (MND)" , "Saint who was a Roman empress" , "St ---, where Napoleon died" .)