Tag and arrest somebody (8)
I believe the answer is:
nickname
'tag' is the definition.
(I've seen this before)
'arrest somebody' is the wordplay.
'arrest' becomes 'nick' (I've seen this before).
'somebody' becomes 'name' (both can mean an individual).
'nick'+'name'='NICKNAME'
'and' is the link.
(Other definitions for nickname that I've seen before include "tag" , "Familiar moniker" , "Familiar form of address" , "Sobriquet" , "Jocular moniker" .)