Crossword Genius

Islay still can make this stop (6)

Ross

I believe the answer is:

scotch

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for scotch that I've seen before include "Kill in Caledonia?" , "Cut - wedge - whisky" , "liquor" , "See 1" , "Put an end to, say rumour" .)

I've seen this clue in The Independent.
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