Only lightly cooked? That's not common (4)

I believe the answer is:

rare

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'that's not common' is the definition.
('rare' is the opposite to 'common')

I can't explain the rest of the clue.

(Other definitions for rare that I've seen before include "Not easily come by like undercooked meat" , "of low density" , "Unusual(ly fine)" , "Infrequent; remarkable" , "Exceptional" .)

I've seen this clue in The Times.

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