Crossword Genius

Locks up animals (5)

Ross

I believe the answer is:

seals

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This clue could be a double definition.

'locks' is the first definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'up animals' is the second definition.
The answer and definition can be both animals as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for seals that I've seen before include "Makes waterproof" , "they're impressive" , "Fastens or closes securely" , "Animals spotted on coast" , "Marine mammals" .)

I've seen this clue in The Mirror.
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