Crossword Genius

Maritime official to hide teacher (13)

Ross

I believe the answer is:

harbourmaster

I'm a little stuck... Click here to teach me more about this clue!

'maritime official' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'hide teacher' is the wordplay.
'hide' becomes 'harbour' (as in harbouring a fugitive).
'teacher' becomes 'master' (I've seen this before).
'harbour'+'master'='HARBOURMASTER'

'to' is the link.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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