Sweeper with ball's opening space (5)
I believe the answer is:
broom
'sweeper' is the definition.
(a broom sweeps things up)
'with ball's opening space' is the wordplay.
'with' is a charade indicator (letters next to each other).
'opening' indicates taking the first letters.
'space' becomes 'room' (room is a kind of space).
The first letter of 'balls' is 'b'.
'b' put next to 'room' is 'BROOM'.
(Other definitions for broom that I've seen before include "Leguminous shrub" , "Sweeper - shrub" , "Plant - sweeper" , "cleaner" , "A new - - sweeps clean" .)