Corrupt cop names head of smuggling ring (9)
I believe the answer is:
encompass
'ring' is the definition.
(thesaurus)
'corrupt cop names head of smuggling' is the wordplay.
'corrupt' is an anagram indicator.
'head of' suggests taking the first letters.
The initial letter of 'smuggling' is 's'.
'cop'+'names'='copnames'
'copnames' is an anagram of 'encompas'.
'encompas'+'s'='ENCOMPASS'
(Other definitions for encompass that I've seen before include "Comprehensively include" , "Comprehend" , "Contrive" , "Contain or encircle" , "ring" .)