Decent over, yes? (7)

I believe the answer is:

upright

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'decent' is the definition.
(thesaurus)

'over yes?' is the wordplay.
'over' becomes 'up' (I've seen this in other clues).
'yes?' becomes 'right' (I can't justify this - if you can you should believe this answer much more).
'up'+'right'='UPRIGHT'

Can you help me to learn more?

(Other definitions for upright that I've seen before include "Vertical like rugby goal post" , "Erect - honest" , "Vertical post in rugby goal - strictly honourable" , "with principle" , "Moral" .)

I've seen this clue in The Telegraph.

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