Keep in a sty (4)

I believe the answer is:

stay

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

'keep' is the definition.
(I've seen this in another clue)

'a sty' is the wordplay.
'a sty' can be anagrammed to 'STAY'.
Though, I am not sure how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for stay that I've seen before include "Supporter" , "Wait" , "Rope bracing a mast etc" , "guy giving > support" , "Check" .)

I've seen this clue in the Evening Standard.

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