Range cooked crumpets (8)
I believe the answer is:
spectrum
'range' is the definition.
(a spectrum is a range or variety)
'cooked crumpets' is the wordplay.
'cooked' is an anagram indicator (letters cooked into a new form).
'crumpets' anagrammed gives 'SPECTRUM'.
(Other definitions for spectrum that I've seen before include "A broad range, of colours say" , "Full range of colour" , "Range of colours, opinions etc" , "All the bands of colour seen in a rainbow" , "Wide range" .)