Course interior that belongs to you and me (4)
I believe the answer is:
ours
'belongs to you and me' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'course interior' is the wordplay.
'interior' says the answer is hidden in the clue (I've seen 'interior of' mean this).
'OURS' is hidden in the letters of 'course'.
'that' is the link.
Can you help me to learn more?
(Other definitions for ours that I've seen before include "Indiscriminate slaughter" , "The French bear" , "Belong to us both" , "Yours and mine!" , "What we share" .)