They sweep basement initially, then kitchen and study (6)
I believe the answer is:
brooms
'they' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see a link between them that I can't see?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for brooms that I've seen before include "Sweeping implements and shrubs" , "Sweepers" , "Sweeping brushes and various shrubs" .)