Maple ____ (5)
'maple' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for acer that I've seen before include "Type of maple" , "Plant" , "Tree of maple family" , "Tree with winged fruit" , "Tree or shrub of the maple genus" .)
(Other definitions for syrup that I've seen before include "Treacly liquid" , "Sugary substance" , "Sticky sugar spread" , "rug?" , "linctus" .)