Light biscuit (5)
'light biscuit' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for macaroon that I've seen before include "Something nutty to enjoy" , "Biscuit of egg-white and almonds or coconut" , "Biscuit made with almond paste" , "Type of biscuit" , "Sweet biscuit made with ground almonds" .)
(Other definitions for wafer that I've seen before include "Communion bread" , "Host's" , "Disc of bread" , "Thin type" , "Thin, crisp biscuit or bread" .)