Stylish establishment warrants reporting (4)

I believe the answer is:

ritz

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'stylish establishment' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for ritz that I've seen before include "Place of expensive luxury" , "Piccadilly hotel" , "The Diamond as Big as the ___ (F. Scott Fitzgerald)" , "Swiss founder of hotel chain" , "establishment of wealth" .)

I've seen this clue in The Telegraph.

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