Crossword Genius

Fish kilometres south of high rocks (5)

Ross

I believe the answer is:

torsk

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

'fish' is the definition.
(torsk is a kind of fish)

'kilometres south of high rocks' is the wordplay.
'kilometres' becomes 'k'.
'south of' means one lot of letters go next to another.
'high rocks' becomes 'tors' (tor is a kind of rock. I am not sure about the 'high' bit.).
'k' after 'tors' is 'TORSK'.

Can you help me to learn more?

(Another definition for torsk that I've seen is " Atlantic fish of cod family".)

I've seen this clue in The Times.
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