Notorious seducer (8)
I believe the answer is:
casanova
'notorious seducer' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for casanova that I've seen before include "Famous lover" , "Male womaniser, after 18th century Italian" , "Predatory male" , "Man with reputation as lover of many women" , "Amorous Venetian" .)