Yes, heartless blond Conservative admits “made up fantasy” (5,5)
I believe the answer is:
fairy story
'up fantasy' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'yes heartless blond conservative admits' is the wordplay.
'heartless' means to remove the middle letters.
'blond' becomes 'fair' (similar in meaning).
'conservative' becomes 'tory' (informal term for a Conservative Party member).
'admits' indicates putting letters inside.
'yes' with its centre removed is 'ys'.
'fair'+'tory'='fairtory'
'ys' placed inside 'fairtory' is 'FAIRY STORY'.
'made' is the link.
Can you help me to learn more?