Crossword Genius

Bride upset about one flier? (6)

Ross

I believe the answer is:

birdie

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

'flier?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'bride upset about one' is the wordplay.
'upset' indicates anagramming the letters.
'about' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'bride' is an anagram of 'brdie'.
'brdie' going around 'i' is 'BIRDIE'.

Can you help me to learn more?

(Other definitions for birdie that I've seen before include "In golf, a score of one under par for the hole" , "low score" , "One watched" , "Golf score of one stroke under par" , "Golfing score better than par" .)

I've seen this clue in The Sun.
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