Crossword Genius

Voting opportunity for Russian bird (7)

Ross

I believe the answer is:

redpoll

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'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" .)

I've seen this clue in the Sydney Morning Herald.
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