Fleece cleaner? (5-3)
I believe the answer is:
sheep-dip
'fleece cleaner?' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sheep-dip that I've seen before include "Fleece disinfectant" , "Fleece cleaner" , "'Pesticide mixture for ovines (5,3)'" , "Farm animal disinfectant" , "Pesticide bath for proverbially silly animals" .)