Topliner running police force (8)
I believe the answer is:
interpol
'police force' is the definition.
'topliner running' is the wordplay.
'running' is an anagram indicator.
'topliner' anagrammed gives 'INTERPOL'.
(Other definitions for interpol that I've seen before include "Multinational crime fighters" , "Lyon-based Police Commission" , "Organisation for international police cooperation" , "Cross-border crimefighters" , "Joined forces" .)