Party nibble (6,5)
'party nibble' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for canape that I've seen before include "Light refreshment" , "Party snack" , "Finger food for parties" , "part of a buffet?" , "Cocktail delicacy" .)
(Other definitions for cheese straw that I've seen before include "savoury snack" , "Party snack" , "pastry" .)