Auditors regret brick red heading (6)

I believe the answer is:

rubric

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'heading' is the definition.
(rubric is a kind of heading)

I can't explain the remainder of the clue.

(Other definitions for rubric that I've seen before include "Instructions at the head of a document" , "Exam paper heading" , "Written instructions" , "Procedure rule (for exam, service)" , "set of instructions" .)

I've seen this clue in the Sydney Morning Herald.

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