Charm is man-bait (6)
I believe the answer is:
allure
'charm' is the definition.
(I've seen this before)
'man-bait' is the wordplay.
'man' becomes 'al'.
'bait' becomes 'lure' ('lure' can be a synonym of 'bait'**).
'al'+'lure'='ALLURE'
'is' acts as a link.
(Other definitions for allure that I've seen before include "Power to attract by personal charm" , "Attractiveness, glamour" , "Powerful attraction" , "Seduce" , "Enticement, attraction" .)