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Maybe Granny has put out Merlot just for show (10)

Ross

I believe the answer is:

ornamental

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'just for show' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for ornamental that I've seen before include "showy" , "Decorative" , "non-functional" , "Plant grown for attractive appearance" , "Fancy" .)

I've seen this clue in The Irish Times.
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