Money accepted by the writer for one session (7)
I believe the answer is:
meeting
'session' is the definition.
(thesaurus)
'money accepted by the writer for one' is the wordplay.
'money' becomes 'tin' (old-fashioned slang term for money).
'accepted by' means one lot of letters goes inside another (inserted letters are accepted).
'the writer' becomes 'me' (the person who wrote the clues).
'for one' becomes 'eg' (both can mean 'for example').
'me'+'eg'='meeg'
'tin' going inside 'meeg' is 'MEETING'.
(Other definitions for meeting that I've seen before include "consultation" , "Encounter" , "Rendezvous" , "Conference" , "Get-together" .)