Crossword Genius

Mere legless confused akela (4)

Ross

I believe the answer is:

lake

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'mere' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for lake that I've seen before include "Large pond; pigment" , "Superior, e.g." , "Purplish-red pigment" , "Mere, tarn" , "holiday up north" .)

I've seen this clue in The Mirror.
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