Clue: Clippings of dishevelled and grubby sheep, what shearer removes? (4)
Answer: DAGS
Explanation: Definition: what shearer removes?
[*clippings of*] **D**(ishevelled) **A**(nd) **G**(rubby) **S**(heep) 
 
 
*A dag is a dirty clot of wool in a sheep's fleece.