Brush rubbish holding broom? (5)
I believe the answer is:
shrub
'broom?' is the definition.
(broom is a kind of shrub)
'brush rubbish holding' is the wordplay.
'holding' indicates the answer is hidden within the clue.
'SHRUB' is hidden within 'brush rubbish'.
(Other definitions for shrub that I've seen before include "Small woody plant" , "box, say" , "Myrtle or Rosemary, say" , "Hazel perhaps" , "Plant - brush (anag)" .)