Blackcurrant cordial (6)

I believe the answer is:

cassis

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

This is all the clue.

(Other definitions for cassis that I've seen before include "Syrupy blackcurrant liqueur" , "Blackcurrant cordial" , "French blackcurrant mixer" , "Blackcurrant syrup" , "Blackcurrent liqueur" .)

I've seen this clue in the Sydney Morning Herald and The Independent.

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