Cryptic crossword clue
Mark, it’s said, was showing signs of aging 6

The most common and most likely answer to this crossword clue is the 6 letter word GREYED

G
R
E
Y
E
D

Buddy explains!

The straight part
We know that "was showing signs of aging" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case was showing signs of aging = greyed.
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 GREYED mean?

GREYED verb
  1. To become grey.
  2. To cause to become grey.
  3. To turn progressively older, in the context of the population of a geographic region.
  4. To give a soft effect to (a photograph) by covering the negative while printing with a ground-glass plate.

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