Seducer of fifty-one sexy maidens (6,3)
I believe the answer is:
ladies man
'seducer' is the definition.
('ladies' man' can be a synonym of 'seducer')
'fifty-one sexy maidens' is the subsidiary indication.
I cannot quite see how this works, but
'fifty' could be 'l' ('l' can be a synonym of 'fifty') and 'l' is present in the answer.
'one' could be 'an' (I've seen this in other clues) and 'an' is present in the answer.
This explanation may well be incorrect...
'of' is the link.
(Other definitions for ladies man that I've seen before include "And is male (anag.)" , "Rake" , "Libertine" , "Lothario" , "Womaniser" .)