Sink accessory (7)
(Other definitions for stopper that I've seen before include "One who checks" , "Plug for a bottle" , "Bung" , "Maybe cork" , "One blocks" .)
'sink accessory' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for drainer that I've seen before include "Crockery drying rack" , "it will be next to sink" , "Rack for wet crockery" , "drying device" , "Where crockery dries" .)