Let rip on spreading force globally (8)
I believe the answer is:
interpol
'force globally' is the definition.
(international police organisation)
'let rip on spreading' is the wordplay.
'spreading' is an anagram indicator.
'let'+'rip'+'on'='letripon'
'letripon' with letters rearranged gives 'INTERPOL'.
(Other definitions for interpol that I've seen before include "International law enforcement agency" , "detectives" , "Organisation for international police cooperation" , "Multinational crime fighters" , "International co-ordinating police body" .)