Crossword Genius

Standard apparently not observed? (8,4)

Ross

I believe the answer is:

anything goes

'standard' is the definition.
(jazz standard by Cole Porter)

I can't explain the rest of the clue.

(Other definitions for anything goes that I've seen before include "West End musical" , "anarchy?" , "musical - with 17a" , "Musical - statement of permissiveness" , "Cole Porter song/musical" .)

I've seen this clue in The Times.
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