Crossword Genius

Every brazen hussy has one (3)

Ross

I believe the answer is:

bra

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'every brazen hussy' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'has one' is the wordplay.
'has' becomes 'br' (I am not sure about this - if you are sure you should believe this answer much more).
'one' becomes 'a' (a thing is one thing).
'br'+'a'='BRA'

Can you help me to learn more?

(Other definitions for bra that I've seen before include "I give a couple a lift" , "Underwear item" , "Female undergarment" , "support" , "one carrying chest" .)

I've seen this clue in the Evening Standard.
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