Broadcast a slogan — it resulted in yearning for the past (9)
I believe the answer is:
'yearning for the past' is the definition.
(I've seen this before)
'broadcast a slogan it' is the wordplay.
'broadcast' indicates an anagram (letters scattered or cast around).
'asloganit' with letters rearranged gives 'NOSTALGIA'.
'resulted in' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for nostalgia that I've seen before include "Looking back with fondness on the past", "longing for home and family", "Sentimental feeling of analogist", "Sentimental reminiscing of analogist", "Attraction to the past".)