Crossword Genius

Shuts up the animals (5)

Ross

I believe the answer is:

seals

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'shuts' is the definition.
(sealing is a kind of shutting)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for seals that I've seen before include "Makes waterproof" , "Great swimmers" , "they're impressive" , "Fastens or closes securely" , "They make an impression" .)

I've seen this clue in The Globe and Mail.
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