King leaves Scottish island after taking some tincture for eye problem (4)

I believe the answer is:

stye

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'eye problem' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for stye that I've seen before include "Red eye" , "Swelling near the eye" , "nasty spot" , "Inflammation around the eye" , "Viewer's complaint" .)

I've seen this clue in The Hindu.

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