Crossword Genius

Upset to see poll down? (2,4,2,1,6)

Ross

I believe the answer is:

as sick as a parrot

I'm a little stuck... Click here to teach me more about this clue!

'see poll down?' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'upset' is the wordplay.
I cannot quite understand how this works, but
'upset' could be 'sick' (similar in meaning) and 'sick' is located in the answer.
This explanation may well be incorrect...

'to' is the link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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