Colour spectrum beyond ordinary, originally (6)
I believe the answer is:
orange
'colour' is the definition.
(I know that orange is a type of pigment)
'spectrum beyond ordinary originally' is the wordplay.
'spectrum' becomes 'range' (a spectrum is a range or variety).
'beyond' says to put letters next to each other.
'originally' indicates taking the first letters.
The initial letter of 'ordinary' is 'o'.
'range' put after 'o' is 'ORANGE'.
(Other definitions for orange that I've seen before include "Unrhymable word?" , "Onager (anag.)" , "Mandarin?" , "Princely house" , "Fruit; pigment" .)