Someone like Mata Hari, but a man (5)
I believe the answer is:
agent
'someone like mata hari' is the definition.
(I know that Mata Hari is a spy)
'a man' is the wordplay.
'man' becomes 'gent' (gent is a kind of man).
'a'+'gent'='AGENT'
'but' acts as a link.
(Other definitions for agent that I've seen before include "One who acts for another" , "One may be working" , "Traveller" , "who can act?" , "Spy - broker" .)