Reveals outdated attitudes (7)

I believe the answer is:

exposes

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'reveals' is the definition.
('expose' can be a synonym of 'reveal')

'outdated attitudes' is the wordplay.
'outdated' becomes 'ex' (I can't explain this - if you can you should believe this answer much more).
'attitudes' becomes 'poses' (I've seen this in other clues).
'ex'+'poses'='EXPOSES'

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(Other definitions for exposes that I've seen before include "Deprives of cover" , "scandalous revelations?" , "Brings to light" , "Reveals" , "Uncovers" .)

I've seen this clue in The Globe and Mail.

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