Wide-ranging task for the cleaners (8)
I believe the answer is:
sweeping
I believe this is a double definition.
'wide-ranging' is the first definition.
(thesaurus)
'task for the cleaners' is the second definition.
(Other definitions for sweeping that I've seen before include "Brushing; generalised" , "Using a broom" , "Raising a dust" , "work for Mrs Mopp" , "clearing the mess?" .)