Rinse strange sticky substance (5)
I believe the answer is:
resin
'sticky substance' is the definition.
(I've seen this before)
'rinse strange' is the wordplay.
'strange' indicates anagramming the letters.
'rinse' with letters rearranged gives 'RESIN'.
(Other definitions for resin that I've seen before include "Elemi, for example" , "Cannabis, say" , "Material exuded from tree" , "Very important part of plastics industry" , "Exudation from fir trees" .)