Confined to bed here, not primarily making sense (8)
I believe the answer is:
coherent
'making sense' is the definition.
(I've seen this before)
'confined to bed here not primarily' is the wordplay.
'confined to' means one lot of letters goes inside another.
'bed' becomes 'cot' (cot is a kind of bed).
'primarily' suggests taking the first letters.
The first letter of 'not' is 'n'.
'here'+'n'='heren'
'cot' placed around 'heren' is 'COHERENT'.
(Other definitions for coherent that I've seen before include "Meaningful" , "Able to speak clearly" , "Sticking together" , "Clear and logical, not confused" , "Logical and lucid" .)