Wide range of toasted crumpets (8)
I believe the answer is:
spectrum
'wide range' is the definition.
(a spectrum is a range or variety)
'toasted crumpets' is the wordplay.
'toasted' is an anagram indicator (I've seen 'toast' mean this (toast can mean damaged or broken)).
'crumpets' is an anagram of 'SPECTRUM'.
'of' is the link.
(Other definitions for spectrum that I've seen before include "Band of refracted colours" , "An entire range of related qualities of crumpets" , "range of tones" , "'Broad range, scope (8)'" , "Crumpets can provide the full array of colours" .)