Shows up former attitudes (7)

I believe the answer is:

exposes

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'shows' is the definition.
(exposing is a kind of showing)

'up former attitudes' is the wordplay.
'up former' becomes 'ex' (prefix meaning former or onetime. I am not sure about the 'up' bit.).
'attitudes' becomes 'poses' (I've seen this in other clues).
'ex'+'poses'='EXPOSES'

Can you help me to learn more?

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

I've seen this clue in the Sydney Morning Herald.

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