The most common and most likely answer to this crossword clue is the 7 letter word CRIMSON
I've seen this crossword clue in Financial Times
C
R
I
M
S
O
N
More clues leading to the result CRIMSON
- Edges into study, bright red
- Carbon limit numbers rising? Looking embarrassed?
- Bloody child behind 80% of lawlessness!
- Blushing politician touring Borders?
- Show without skirts makes you blush
- Deep red lips engaged in deception
- Red fences maybe acceptable
- Beginning of symphony in C minor turned bloody
- Blush from boy after brief sin
- Red skirts — rip off skirting
Buddy explains!

The straight part
We know that "Red" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case red = crimson.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 CRIMSON mean?
CRIMSON noun- A deep, slightly bluish red.
- To become crimson or deep red; to blush.
- To dye with crimson or deep red; to redden.
- Having a deep red colour.
- Immodest.