Included one conclusion within another (8)
I believe the answer is:
enclosed
'included' is the definition.
(I've seen this before)
'one conclusion within another' is the wordplay.
I cannot quite understand how this works, but
'conclusion' could be 'close' (synonyms) and 'close' is found within the answer.
'another' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for enclosed that I've seen before include "Surrounded completely, caged" , "Held" , "Shut up or included in an envelope" , "Confined" , "Surrounded on all sides" .)