Crossword Genius

Agent of intelligence? (3)

Ross

I believe the answer is:

spy

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This might be a double definition.

'agent' is the first definition.
(spy is a kind of agent)

'intelligence?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for spy that I've seen before include "Keep watch secretly, maybe for foreign government" , "Undercover agent" , "Notice" , "Mole, agent" , "One gathers information on enemies" .)

I've seen this clue in the Evening Standard.
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