The most common and most likely answer to this crossword clue is the 7 letter word MAGENTA
I've seen this crossword clue in Financial Times
M
A
G
E
N
T
A
More clues leading to the result MAGENTA
- Woman with issue dressing a fellow in deep shade
- Colour is a factor adopted by successful arts student
- Male spy, a reddish colour
- Mum clothes a nice man in purple
- Colour supplement sent without its first article
- Colour magazine regularly seen at bar
- Old woman welcoming a civilised chap in purple
- Mobile meant to maintain a good tone
- Progenitor concealing eye colour
- School sent back tablet and books with a 21
Buddy explains!

The straight part
We know that "purple" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case purple = magenta.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 MAGENTA mean?
MAGENTA noun- A vibrant light purple, purplish-red, reddish-purple, or pinkish purple colour obtained by mixing red and blue light (thus a secondary colour), but primary in the CMYK colour system used in printing.
- Having the colour of fuchsia, fuchsine, light purple.