The colour finally preferred (3)
I believe the answer is:
red
'the colour' is the definition.
(red is a kind of colour)
'finally preferred' is the wordplay.
'RED' is hidden within the letters.
However, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for red that I've seen before include "Very angry, seeing this" , "Colour of blood" , "eg Cardinal" , "Stop light" , "Primary colour" .)