Harbour master? (5)

I believe the answer is:

pilot

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'harbour master?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

This is the entire clue.

Can you help me to learn more?

(Other definitions for pilot that I've seen before include "Plane driver" , "Name of Mr Rochester's dog" , "Airman" , "Driver of aircraft" , "Aviator" .)

I've seen this clue in the Evening Standard.

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