Spy an upper-class man? (5)

I believe the answer is:

agent

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'spy' is the definition.
(secret agent)

'an upper-class man?' is the wordplay.
'an' becomes 'a'.
'upper-class man?' becomes 'gent' (gent is a kind of man. I am not sure about the 'upper-class' bit.).
'a'+'gent'='AGENT'

Can you help me to learn more?

(Other definitions for agent that I've seen before include "Sales rep" , "One may be working" , "Actor" , "Operative" , "Factor, spy" .)

I've seen this clue in The Sun.

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