Crossword Genius

Former lover acting falsely is revealing (8)

Ross

I believe the answer is:

exposing

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

'former lover acting falsely' is the wordplay.
'former lover' becomes 'ex' (ex-lover).
'acting falsely' becomes 'posing' (I can't justify this - if you can you should give a lot more credence to this answer).
'ex'+'posing'='EXPOSING'

'is' is the link.

Can you help me to learn more?

(Other definitions for exposing that I've seen before include "outing" , "Showing up" , "Subjecting to light, making known" , "Uncovering" .)

I've seen this clue in The Times.
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