Meeting politician with diplomacy (7)
I believe the answer is:
contact
'meeting' is the definition.
(contact is a kind of meeting)
'politician with diplomacy' is the wordplay.
'politician' becomes 'con'.
'with' means one lot of letters go next to another.
'diplomacy' becomes 'tact' (I've seen this before).
'con'+'tact'='CONTACT'
(Other definitions for contact that I've seen before include "Connection" , "Close interaction" , "Touching" , "Touch - electrical point" , "Get in touch with" .)