Cryptic crossword clue
Conservative editor run down, for adding a mark to change pronunciation 7

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

C
E
D
I
L
L
A


Buddy explains!

The straight part
We know that "mark to change pronunciation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mark to change pronunciation = cedilla.
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 CEDILLA mean?

CEDILLA noun
  1. In the spelling of Catalan, French, Portuguese and some other languages, a mark (¸) sometimes placed under the letter c to indicate that it is pronounced /s/ rather than /k/, as in Catalan força, French menaçant, and Portuguese almoço, and also used in various other languages to change the sounds of other letters.

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