Hes secretive and hostile in traffic (5,5)

I believe the answer is:

enemy agent

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'hes secretive' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'hostile in traffic' is the wordplay.
'hostile' becomes 'enemy' (similar in meaning).
'in traffic' becomes 'agent' (I can't justify this - if you can you should give a lot more credence to this answer).
'enemy'+'agent'='ENEMY AGENT'

'and' acts as a link.

Can you help me to learn more?

(Another definition for enemy agent that I've seen is " Opposite number".)

I've seen this clue in The Irish News.

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