Confined to bed at this point, not primarily making sense (8)
I believe the answer is:
coherent
'making sense' is the definition.
(I've seen this before)
'confined to bed at this point not primarily' is the wordplay.
'confined to' is an insertion indicator.
'bed' becomes 'cot' (cot is a kind of bed).
'at this point' becomes 'here' (I've seen this before).
'primarily' indicates taking the first letters.
The initial letter of 'not' is 'n'.
'here'+'n'='heren'
'cot' enclosing 'heren' is 'COHERENT'.
(Other definitions for coherent that I've seen before include "Sticking together" , "Logical and lucid" , "Not rambling in speech or reasoning" , "making sense" , "Able to speak logically" .)