Truth from a Conservative framed by newspaper (4)
I believe the answer is:
fact
'truth' is the definition.
(I've seen this before)
'a conservative framed by newspaper' is the wordplay.
'conservative' becomes 'c' (abbreviation commonly used in UK politics).
'framed by' means one lot of letters goes inside another.
'newspaper' becomes 'ft'.
'a'+'c'='ac'
'ac' inserted into 'ft' is 'FACT'.
'from' acts as a link.
(Other definitions for fact that I've seen before include "given" , "An indisputable truth" , "Datum" , "Piece of information known to be true" , "Actuality" .)