Crossword Genius

Show up a bygone attitude (6)

Ross

I believe the answer is:

expose

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'show up' is the definition.
(I've seen this before)

'a bygone attitude' is the wordplay.
'a bygone' becomes 'ex' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'attitude' becomes 'pose' (attitude can mean a pose or stance).
'ex'+'pose'='EXPOSE'

Can you help me to learn more?

(Other definitions for expose that I've seen before include "Lay out to view" , "article on scandal?" , "hazard" , "Reveal, uncover" , "brings out crime" .)

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