At Troon, of course, the tee is one (for starting) (7)

I believe the answer is:

capital

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'starting' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for capital that I've seen before include "Big money?" , "Major city - investment - excellent" , "Cardinal; splendid; assets" , "savings" , "Means" .)

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