Crossword Genius

Showing a certain incorruptibility unusual for Proust (9)

Ross

I believe the answer is:

rustproof

'showing a certain incorruptibility' is the definition.
(unable to be rusted)

'unusual for proust' is the wordplay.
'unusual' is an anagram indicator.
'for'+'proust'='forproust'
'forproust' is an anagram of 'RUSTPROOF'.

(Other definitions for rustproof that I've seen before include "(Of iron) resistant to oxidisation" , "Impervious to irony tainting" , "(Of iron) not susceptible to corrosion" .)

I've seen this clue in The Times.
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