Political declaration should demonstrate love (9)
I believe the answer is:
manifesto
'political declaration should' is the definition.
I can't judge whether this defines the answer.
'demonstrate love' is the wordplay.
'demonstrate' becomes 'manifest' (synonyms).
'love' becomes 'o' (love means zero in tennis).
'manifest'+'o'='MANIFESTO'
Can you help me to learn more?
(Other definitions for manifesto that I've seen before include "Declaration of intentions by a political party" , "Public declaration of intent" , "Planks assembled here" , "Proclamation" , "Written declaration of opinions" .)