Observer framed regular couple in case (5,3)

'case' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'observer framed regular couple' is the wordplay.
'observer' becomes 'scout' (I can't explain this - if you can you should believe this answer much more).
'framed' is an insertion indicator.
'regular' means one should take alternating letters.
The alternate letters of 'couple' are 'ope'.
'scout' placed around 'ope' is 'SCOPE OUT'.

'in' is the link.

Can you help me to learn more?