Confident, hosting female sex in excess (7)
I believe the answer is:
surfeit
'excess' is the definition.
(synonyms)
'confident hosting female sex' is the wordplay.
'confident' becomes 'sure' (similar in meaning).
'hosting' indicates putting letters inside (inserted letters are welcomed in or hosted).
'female' becomes 'f' (abbreviation).
'sex' becomes 'it' (common euphemism).
'sure' going around 'f' is 'surfe'.
'surfe'+'it'='SURFEIT'
'in' acts as a link.
(Other definitions for surfeit that I've seen before include "Excess, glut" , "excessive amount" , "Superabundance" , "stuff, once" , "Overindulge" .)