Crossword Genius

Swimmer's called inconsiderate when putting beginners off (9)

Ross

I believe the answer is:

angelfish

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

'swimmer's' is the definition.
(angelfish is a kind of aquatic vertebrate)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for angelfish that I've seen before include "shark" , "Brightly-coloured swimmer" .)

I've seen this clue in The Independent.
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