Tracks across poles to find supporters (8)
I believe the answer is:
sponsors
'supporters' is the definition.
('sponsor' can be a synonym of 'supporter')
'tracks across poles' is the wordplay.
'tracks' becomes 'spoors' (spoor is a kind of track**).
'across' indicates putting letters inside.
'poles' becomes 'ns' (North and South poles).
'spoors' enclosing 'ns' is 'SPONSORS'.
'to find' is the link.
(Other definitions for sponsors that I've seen before include "Those who pay for the endeavours of others" , "They contribute towards costs in return for publicity" , "They finance events" .)