Easy mark
'easy mark' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for sucker that I've seen before include "Underground shoot from shrub, or slang victim" , "Shoot from plant roots or informal victim" , "Gull" , "Shoot growing from roots or person easily deceived" , "Plant shoot; gullible type" .)
'easy mark' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sap that I've seen before include "Plant liquid or general vitality" , "Plant juice; undermine" , "One is easily fooled" , "Undermine the tree juice" , "Fluid in plant stem" .)
'easy mark' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for patsy that I've seen before include "Fall guy - girl's name" , "One who is taken advantage of (mainly US)" .)