Former partner at German residence attends regularly, though they're utterly jaded (9)
I believe the answer is:
exhausted
'jaded' is the definition.
(exhausting is a kind of jading)
'former partner at german residence attends regularly' is the wordplay.
'former partner' becomes 'ex' (an ex-partner).
'at' says to put letters next to each other.
'german residence' becomes 'haus' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'attends' are 'ted'.
'ex'+'haus'+'ted'='EXHAUSTED'
'though they're utterly' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for exhausted that I've seen before include "ready for bed" , "Drained of strength" , "Complete fatigued" , "All in, really tired" , "Dead-beat" .)