A smuggler with more than two arms (9)
I believe the answer is:
gunrunner
'a smuggler' is the definition.
(gunrunner is a kind of smuggler)
'two arms' is the wordplay.
'two arms' can mean two replacements for 'arm'.
'arm' becomes 'gun' (gun is a kind of arm).
'arm' becomes 'runner' (I can't justify this - if you can you should believe this answer much more).
'gun'+'runner'='GUNRUNNER'
'with more than' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for gunrunner that I've seen before include "one who moves arms impermissibly" , "Arms smuggler" , "Illegal arms dealer" , "one secretly moves pieces?" .)