Clean up the stud (4)
I believe the answer is:
dust
'clean' is the definition.
(dust can mean to clean up dust)
'up the stud' is the wordplay.
'up' indicates anagramming the letters (letters get chucked up).
'stud' is an anagram of 'DUST'.
(Other definitions for dust that I've seen before include "Do some housework - we all come to it!" , "Fine powdery material that can be blown about in the air" , "Fine dry powder" , "Microscopic particles in the air" , "Stud (anag)" .)