Crossword Genius

As worn by Brenda endlessly? (3)

Ross

I believe the answer is:

bra

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

I can't explain the remainder of the clue.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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