Reddish-purple (7)
I believe the answer is:
magenta
'reddish-purple' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for magenta that I've seen before include "this might be an ink" , "Bright purplish-red" , "Deep purplish red" , "fuchsia" , "Colourful" .)