In the matter of escorts for harbours in old Scotland (6)

I believe the answer is:

resets

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

'harbours in old scotland' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot understand how they can define each other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for resets that I've seen is " Readjusts".)

I've seen this clue in The Sunday Times and The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.