Noble having sex with French philosopher (7)
I believe the answer is:
vicomte
'noble' is the definition.
(I've seen this before)
'sex with french philosopher' is the wordplay.
'sex' becomes 'vi' ('sex' is Latin for 'six' or VI in Roman numerals).
'with' is a charade indicator (letters next to each other).
'french philosopher' becomes 'comte' (I've seen this before. I am not sure about the 'french' bit.**).
'vi'+'comte'='VICOMTE'
'having' acts as a link.
Can you help me to learn more?
(Other definitions for vicomte that I've seen before include "Foreign nobleman" , "French nobleman" , "Noble" .)