Crossword Genius

Swimmer shockingly flashing around pier - not very good (10)

Ross

I believe the answer is:

anglerfish

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

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

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

Can you help me to learn more?

I've seen this clue in The Independent.
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