Poles kept in track for promoter (7)
I believe the answer is:
sponsor
'promoter' is the definition.
(thesaurus)
'poles kept in track' is the wordplay.
'poles' becomes 'ns' (North and South poles).
'kept in' indicates putting letters inside.
'track' becomes 'spoor' (spoor is a kind of track).
'ns' put inside 'spoor' is 'SPONSOR'.
'for' is the link.
(Other definitions for sponsor that I've seen before include "Angel" , "Promoter; funder" , "One funding an event" , "Bankroll" , "Finance (an event)" .)