Reveal, when you sit beside your former partner (6)

I believe the answer is:

expose

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'reveal' is the definition.
(exposing is a kind of revealing)

'former partner' is the wordplay.
'former' becomes 'ex'.
'partner' becomes 'pose' (I can't explain this - if you can you should give a lot more credence to this answer).
'ex'+'pose'='EXPOSE'

'when you sit beside your' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for expose that I've seen before include "Show up" , "Bring into view" , "Disclose" , "Open to view" , "Uncover, expose to view" .)

I've seen this clue in the Evening Standard.

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