Vessels for suckers? (4)
I believe the answer is:
mugs
This clue is a double definition.
'vessels' is the first definition.
(mug is a kind of vessel)
'suckers?' is the second definition.
('mug' can be a synonym of 'sucker')
'for' is the link.
(Other definitions for mugs that I've seen before include "Cylindrical cups without saucer" , "'Cups, faces and fall guys (4)'" , "Cups without saucers" , "Faces (sl.)" , "Drinking cups" .)