Stud disturbing grime (4)
I believe the answer is:
dust
'grime' is the definition.
(thesaurus)
'stud disturbing' is the wordplay.
'disturbing' indicates anagramming the letters.
'stud' with letters rearranged gives 'DUST'.
(Other definitions for dust that I've seen before include "Powdery dirt in dry areas" , "Tiny particles of dirt, skin flakes etc" , "Powdered eart" , "Clean - dirt" , "Fine dirt particles" .)