Crossword Genius

One representing, for a long time, the National Theatre? (5)

Ross

I believe the answer is:

agent

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'one representing' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'long time the national theatre?' is the wordplay.
'long time' becomes 'age' (an age is a period of time).
'the national theatre?' becomes 'NT' (abbreviation).
'age'+'nt'='AGENT'

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for agent that I've seen before include "who can act?" , "Spy - broker" , "envoy" , "Salesman" , "Factor, spy" .)

I've seen this clue in the Evening Standard.
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