Savoury snack (6)
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I believe the answer is:
'savoury snack' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for canape that I've seen before include "Light refreshment" , "Small savoury item" , "Small savoury on toast or bread" , "bite to eat" , "Savoury appetiser, often accompanied by Champagne" .)