Pastille (7)

I believe the answer is:

lozenge

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

This is all the clue.

(Other definitions for lozenge that I've seen before include "Rhombus; tablet" , "Quadrilateral" , "Diamond-shaped parallelogram" , "Diamond shape - pastille" , "Medicine tablet" .)

I've seen this clue in the Evening Standard, The Independent, The Times and The Sunday Times.

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