Crossword Genius

Live with a rook: ferocious creature! (4)

Ross

I believe the answer is:

bear

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'ferocious creature' is the definition.
'bear' can be an answer for 'creature' (bear is a kind of creature). I'm not certain of the 'ferocious' bit.

'live with a rook' is the wordplay.
'live' becomes 'be' (synonyms).
'with' says to put letters next to each other.
'rook' becomes 'R' (chess abbreviation).
'be'+'a'+'r'='BEAR'

Can you help me to learn more?

(Other definitions for bear that I've seen before include "Carry; large mammal" , "Support; produce (fruit)" , "a churlish individual" , "rude fellow" , "Massive mammal" .)

I've seen this clue in The Times.
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