Crossword Genius

Fish drift off, mostly upside down! (4)

Ross

I believe the answer is:

eels

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'fish' is the definition.
(eel is a type of fish)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for eels that I've seen before include "Water snakes twisting in lees" , "Smooth fishes" , "Else (anag.)" , "Slippery creatures" , "They have long bodies and very small fins" .)

I've seen this clue in The Times.
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