Cryptic crossword clue
Establishing standard old room in local 9

The most common and most likely answer to this crossword clue is the 9 letter word NORMATIVE

I've seen this crossword clue in The Times
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The straight part
We know that "Establishing standard" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case establishing standard = normative.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does NORMATIVE mean?

NORMATIVE adjective
  1. Of or pertaining to a norm or standard.
  2. Conforming to a norm or norms.
  3. Attempting to establish or prescribe a norm.

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