Crossword Genius

Offer that is about right although below par (6)

Ross

I believe the answer is:

birdie

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

'although below par' is the definition.
The answer and definition can be both quantities as well as being singular nouns.
Maybe there's a link between them I don't understand?

'offer that is about right' is the wordplay.
'offer' becomes 'bid' (bid is a kind of offer).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'about' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'bid'+'ie'='bidie'
'bidie' going around 'r' is 'BIRDIE'.

Can you help me to learn more?

(Other definitions for birdie that I've seen before include "Good hole" , "Golf score of one stroke under par" , "One watched" , "One under in 20 across" , "In golf, a score of one under par for the hole" .)

I've seen this clue in The Globe and Mail.
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