Hapless victim (3)
'hapless victim' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sap that I've seen before include "The juice in trees" , "Juice; energy" , "Vigour, energy" , "Weaken; tree fluid" , "trench used in siege" .)
'hapless victim' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sucker that I've seen before include "Gull" , "Dupe" , "with straw in mouth?" , "Shoot from plant roots or informal victim" , "Naive type: shoot" .)