Rope and anchorage at sea for expert there (13)

I believe the answer is:

oceanographer

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

'expert there' is the definition.
I can't judge whether this definition defines the answer.

'rope and anchorage at sea' is the wordplay.
'and' is a charade indicator (letters next to each other).
'at sea' indicates an anagram.
'rope'+'anchorage'='ropeanchorage'
'ropeanchorage' is an anagram of 'OCEANOGRAPHER'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for oceanographer that I've seen before include "One studying the great seas" , "Scientist concerned with the seas" , "One who studies the seas" , "Marine scientist" .)

I've seen this clue in 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.