Sweeping, drastic (7)
I believe the answer is:
radical
This clue is a double definition.
'sweeping' is the first definition.
(I've seen this in another clue)
'drastic' is the second definition.
(I've seen this before)
(Other definitions for radical that I've seen before include "Total" , "Dial car in order to be drastic" , "Progressive - car dial (anag)" , "Extreme, ultra" , "(One) favouring fundamental changes" .)