Cryptic crossword clue
One may follow this river northwards when in control 9

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

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Buddy explains!

The straight part
We know that "One may follow this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one may follow this = guideline.
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 GUIDELINE mean?

GUIDELINE noun
  1. A non-specific rule or principle that provides direction to action or behaviour.
  2. A plan or explanation to guide one in setting standards or determining a course of action.
  3. A light line, used in lettering, to help align the text.

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