Cryptic crossword clue
Badger editor being installed to establish fundamental principles 7

The most common and most likely answer to this crossword clue is the 7 letter word BEDROCK

I've seen this crossword clue in The Daily Telegraph
B
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Buddy explains!

The straight part
We know that "fundamental principles" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fundamental principles = bedrock.
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 BEDROCK mean?

BEDROCK noun
  1. The solid rock that exists at some depth below the ground surface. Bedrock is rock "in place", as opposed to material that has been transported from another location by weathering and erosion.
  2. A basis or foundation.

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