Young lady: one working for special embassy (7)

I believe the answer is:

mission

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'special embassy' is the definition.
'mission' can be an answer for 'embassy' (I've seen this before). I am not sure about the 'special' bit.

'young lady one working' is the wordplay.
'young lady' becomes 'miss' (term of address for a young woman).
'one' becomes 'i' (Roman numeral).
'working' becomes 'on' (on can mean working or activated).
'miss'+'i'+'on'='MISSION'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for mission that I've seen before include "Important assignment" , "religious establishment" , "Assignment - calling" , "Very dangerous assignment -- Tom Cruise film series" , "Delegation" .)

I've seen this clue in The Times.

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