One that flies from socialist vote (7)
I believe the answer is:
Here is my best explanation:
'one that flies' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'socialist vote' is the wordplay.
'socialist' becomes 'red' (red is a kind of socialist).
'vote' becomes 'poll' (polling is a kind of voting).
'from' acts as a link.