The most common and most likely answer to this crossword clue is the 7 letter word SCARLET
I've seen this crossword clue in Financial Times
S
C
A
R
L
E
T
More clues leading to the result SCARLET
- Red vehicle learner, English, parked in street
- Mark of wound allowed to be red
- Foreman maybe embraced by group blushing?
- Colour of vehicle learner included in matching collection
- Red 10 possibly left in position
- Little mark left by wound, but very red?
- C of 5 across, roughly
- Red alert’s changed – first among comrade’s locked up
- Brightly coloured small mini-vehicle?
- Red cloak left in fright close to forest
Buddy explains!

The straight part
We know that "C" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case c = scarlet.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 SCARLET mean?
SCARLET noun- A brilliant red colour tinged with orange.
- Cloth of a scarlet color.
- To dye or tinge with scarlet.
- Of a bright red colour.
- Sinful or whorish.
- (Ireland) Tragic or disappointing.