Highland cattle around a former landing stage (3)

I believe the answer is:

kay

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

'stage' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for kay that I've seen before include "K" , "Eleventh letter; girl's name" .)

I've seen this clue in The Times and The Sunday Times.

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