Crossword Genius

Two flats? That sounds rich (6)

Ross

I believe the answer is:

loaded

'rich' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

(Other definitions for loaded that I've seen before include "Burdened; rich (slang)" , "Big Bertha sometimes was" , "Wealthy (slang) - drunk (slang)" , "Charged with ammunition" , "Biased, wealthy (colloq.)" .)

I've seen this clue in The Guardian.
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