Crossword Genius

Reels in long form of sealife (3)

Ross

I believe the answer is:

eel

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

'long form of sealife' is the definition.
I can't tell whether this definition defines the answer.

'reels in' is the wordplay.
'in' indicates a hidden word.
'EEL' is hidden in the letters of 'reels'.

Can you help me to learn more?

(Other definitions for eel that I've seen before include "Elongated fish" , "Snaky fish" , "Long smooth fish" , "Electric swimmer, perhaps?" , "Slimy fish" .)

I've seen this clue in The Mirror.
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