Due to a couple being happy (9)

I believe the answer is:

overjoyed

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'being happy' is the definition.
(I've seen this in another clue)

'due to a couple' is the wordplay.
'due to' becomes 'over' (as in quitting a job over an issue).
'a couple' becomes 'joyed' (I can't justify this - if you can you should believe this answer much more).
'over'+'joyed'='OVERJOYED'

Can you help me to learn more?

(Other definitions for overjoyed that I've seen before include "Delighted" , "Ecstatic" .)

I've seen this clue in the Evening Standard.

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