Voting opportunity for Russian bird (7)
I believe the answer is:
redpoll
'voting opportunity' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'russian bird' is the wordplay.
'russian' becomes 'red' (red can informally mean communist).
'bird' becomes 'poll' (poll is a kind of bird).
'red'+'poll'='REDPOLL'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for redpoll that I've seen before include "Bird" , "Flyer" , "finch" , "cow" .)