Crossword Genius

Undermine brat with look (6)

Ross

I believe the answer is:

impair

'undermine' is the definition.
(thesaurus)

'brat with look' is the wordplay.
'brat' becomes 'imp'.
'with' is a charade indicator (letters next to each other).
'look' becomes 'air' (I've seen this before).
'imp'+'air'='IMPAIR'

(Other definitions for impair that I've seen before include "Damage or injure" , "Hurt or handicap" , "Weaken, damage" , "Hobble" , "Damage or handicap" .)

I've seen this clue in The Telegraph.
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