In which people parrot their opinions? (4)

I believe the answer is:

poll

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'in which people parrot their opinions?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

This is all the clue.

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(Other definitions for poll that I've seen before include "one proverbially sick?" , "less ambitious students" , "Test of voting opinion" , "coverage of vote for 9d > [WHISTLE BLOWER]" , "straw, for example" .)

I've seen this clue in the Evening Standard.

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