Short listed Siamese, say (3)

I believe the answer is:

cat

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'siamese say' is the definition.
(siamese is a kind of cat)

I cannot understand how the remainder of the clue works.

(Other definitions for cat that I've seen before include "Sailor's whip with nine knotted strands" , "one's pyjamas? They're an excellent thing" , "Feline mammel" , "Eg, tiger, lion" , "Grimalkin" .)

I've seen this clue in the Evening Standard.

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