Crossword Genius

Drives back less pure in disorder (8)

Ross

I believe the answer is:

repulses

'drives back' is the definition.
('repulse' can be a synonym of 'drive back')

'less pure in disorder' is the wordplay.
'in disorder' indicates anagramming the letters.
'less'+'pure'='lesspure'
'lesspure' is an anagram of 'REPULSES'.

(Another definition for repulses that I've seen is " Rebuffs, repels".)

I've seen this clue in The Irish Independent.
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