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Aquatic mammals (5)

Ross

I think it could be either:

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5

6

seals

'aquatic mammals' is the definition.
(seal is a kind of aquatic mammal)

This is all the clue.

(Other definitions for seals that I've seen before include "Makes waterproof" , "They make an impression" , "Animals spotted on coast" , "Marine mammals" , "they're impressive" .)

I've seen this clue in The Wall Street Journal and The Mirror.
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