Crossword Genius

Such a victory as the road cleaner won over dirt? (8)

Ross

I believe the answer is:

sweeping

'the road cleaner won over dirt?' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I can't see?

'such a victory as' is the wordplay.
'such a victory' becomes 'sweep' (sweep is a kind of victory).
'as' becomes 'ing' (I can't explain this - if you can you should give a lot more credence to this answer).
'sweep'+'ing'='SWEEPING'

Can you help me to learn more?

(Other definitions for sweeping that I've seen before include "not very specific", "Extensive", "Brushing or ignoring distinctions", "Brushing; generalised", "all-encompassing".)

I've seen this clue in Evening Standard.
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