Cryptic crossword clue
Most difficult singular argument is in French 8

The most common and most likely answer to this crossword clue is the 8 letter word STIFFEST

I've seen this crossword clue in Financial Times
S
T
I
F
F
E
S
T

Buddy explains!

The straight part
We know that "Most difficult" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most difficult = stiffest.
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 STIFFEST mean?

STIFFEST adjective
  1. (of an object) Rigid; hard to bend; inflexible.
  2. (of policies and rules and their application and enforcement) Inflexible; rigid.
  3. (of a person) Formal in behavior; unrelaxed.
  4. Harsh, severe.
  5. (of muscles or parts of the body) Painful as a result of excessive or unaccustomed exercise.
  6. Potent.
  7. Dead, deceased.
  8. (of a penis) Erect.
  9. (of whipping cream or egg whites) Beaten until so aerated that they stand up straight on their own.
  10. Of an equation: for which certain numerical solving methods are numerically unstable, unless the step size is taken to be extremely small.
  11. Keeping upright.

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