Dye coloured in a cloche (9)
I believe the answer is:
cochineal
'dye' is the definition.
(I know that cochineal is a type of dye)
'coloured in a cloche' is the wordplay.
'coloured' indicates an anagram.
'in'+'a'+'cloche'='inacloche'
'inacloche' with letters rearranged gives 'COCHINEAL'.
(Other definitions for cochineal that I've seen before include "Red food colouring" , "Crimson dye from crushed insects" , "Scarlet dye - in a cloche (anag)" , "Red food dye (from beetles)" , "Red colour" .)