Crossword Genius

A decreasing asset in a boring club (8)

Ross

I believe the answer is:

flatiron

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

'boring club' is the wordplay.
'boring' becomes 'flat' (flat can mean dull or lifeless).
'club' becomes 'iron' (type of golf club).
'flat'+'iron'='FLATIRON'

'in a' acts as a link.

Can you help me to learn more?

(Other definitions for flatiron that I've seen before include "that's no longer a pressing requirement" , "Old device for pressing clothes" , "household appliance" , "Old-fashioned clothes presser" , "Pre-electric clothes presser" .)

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