Crossword Genius

Boar with pearls: preposterous, they're savage beasts (5,5)

Ross

I believe the answer is:

polar bears

I'm a little stuck... Click here to teach me more about this clue!

'savage beasts' is the definition.
The answer and definition can be both animals as well as being plural nouns.
Perhaps there's a link between them I don't understand?

'boar with pearls preposterous' is the wordplay.
'with' says to put letters next to each other.
'preposterous' indicates an anagram.
'boar'+'pearls'='boarpearls'
'boarpearls' anagrammed gives 'POLAR BEARS'.

'they're' acts as a link.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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