In the direction of a harbour? (5)

I believe the answer is:

aport

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

'in the direction' is the definition.
I can't tell whether this defines the answer.

'a harbour?' is the wordplay.
'harbour?' becomes 'port' (harbour is a kind of port).
'a'+'port'='APORT'

'of' is the link.

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