Conservative found entertaining politician screwed up (8)
I believe the answer is:
crumpled
'screwed up' is the definition.
(screw up can mean to crumple)
'conservative found entertaining politician' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'found' becomes 'ruled' (as in ruling or finding in court).
'entertaining' indicates putting letters inside.
'politician' becomes 'MP' (Member of Parliament).
'ruled' going around 'mp' is 'rumpled'.
'c'+'rumpled'='CRUMPLED'
(Other definitions for crumpled that I've seen before include "collapsed" , "Wrinkly" , "Creased, wrinkled" .)