Big cat joins discussion (4)

I believe the answer is:

lynx

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

'big cat' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for lynx that I've seen before include "Northern short-tailed wild cat(s)" , "One with sharp eyes" , "Wildcat noted for keen sight" , "Animal that's spotted" , "Bobcat" .)

I've seen this clue in the Sydney Morning Herald.

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