Pass on story about Democrat clash (7)
I believe the answer is:
collide
'clash' is the definition.
(synonyms)
'pass on story about democrat' is the wordplay.
'pass' becomes 'col' (col is a term for a mountain pass).
'on' means one lot of letters go next to another.
'story' becomes 'lie' (story can mean a fabrication).
'about' indicates putting letters inside.
'democrat' becomes 'd'.
'lie' enclosing 'd' is 'lide'.
'col'+'lide'='COLLIDE'
(Other definitions for collide that I've seen before include "Dash together; clash" , "Run into" , "Clash; conflict" , "Crash together" , "Come into conflict" .)