Rinse out sticky stuff (5)
I believe the answer is:
resin
'sticky stuff' is the definition.
(sticky substance)
'rinse out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'rinse' with letters rearranged gives 'RESIN'.
(Other definitions for resin that I've seen before include "Sticky stuff oozing from trees" , "Sticky stuff for siren" , "It's obtained from tree-sap" , "Exudation from fir trees" , "Sticky exudation from trees" .)