Washbasin (4)
I believe the answer is:
sink
'washbasin' is the definition.
(I know that washbasin can be written as sink)
This is the entire clue.
(Other definitions for sink that I've seen before include "Succeed in putting" , "Washing facility" , "something needed in kitchen" , "Basin for washing up etc" , "Invest capital in - kitchen basin - founder" .)