Crossword Genius

Vegetable or flightless bird picked up in US port (6)

Ross

I believe the answer is:

peoria

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

'flightless bird picked up in us port' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'vegetable or' is the wordplay.
I cannot quite understand how this works, but
'or' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for peoria that I've seen is " O, a ripe town in Illinois".)

I've seen this clue in The Times and The Sunday Times.
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