Old boy taking Times with inclination to go round as campaigner (8)
I believe the answer is:
lobbyist
'campaigner' is the definition.
(I've seen this before)
'old boy taking times with inclination to go round' is the wordplay.
'old boy' becomes 'OB' (abbreviation for a private school 'old boy').
'taking times' becomes 'by' (both can mean 'multiplied by'. I am not sure about the 'taking' bit.).
'with' is a charade indicator (letters next to each other).
'inclination' becomes 'list' (list can mean to tilt, lean or incline).
'to go round' means one lot of letters goes inside another.
'ob'+'by'='obby'
'obby' placed inside 'list' is 'LOBBYIST'.
'as' acts as a link.
(Other definitions for lobbyist that I've seen before include "pusher" , "figure influencing lawmakers" , "One tries to influence government in favour of their cause" , "political campaigner" , "'To - it may concern'" .)