Crossword Genius

Animal left at the waterside (4)

Ross

I believe the answer is:

seal

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'the waterside' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'animal left' is the wordplay.
'animal' becomes 'sea' (sea animal is a kind of animal).
'left' becomes 'L' (common abbreviation).
'sea'+'l'='SEAL'

'at' is the link.

Can you help me to learn more?

(Other definitions for seal that I've seen before include "Stamp of approval" , "Close - (performing?) animal" , "Close up - marine mammal" , "Stamp of guarantee" , "Marine animal or sign of authenticity" .)

I've seen this clue in the Evening Standard.
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