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Ladies and Gentlemen Prefer Blondes, in my book (4)

Ross

I believe the answer is:

loos

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'ladies and gentlemen' is the definition.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for loos that I've seen before include "Conveniences" , "Austrian architect" .)

I've seen this clue in The Telegraph.
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