Cryptic crossword clue
Variable direction, that is on road is the most frivolous 9

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

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Buddy explains!

The straight part
We know that "most frivolous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most frivolous = yeastiest.
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 YEASTIEST mean?

YEASTIEST adjective
  1. Having or resembling yeast.
  2. Foamy and frothy.
  3. Emotionally bubbling over (as with exuberance)
  4. Trivial.

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