Scope for making crumpets (8)
I believe the answer is:
spectrum
'scope' is the definition.
(spectrum is a kind of scope)
'making crumpets' is the wordplay.
'making' is an anagram indicator.
'crumpets' with letters rearranged gives 'SPECTRUM'.
'for' acts as a link.
(Other definitions for spectrum that I've seen before include "Broad range of related items" , "Range of colours, opinions etc" , "Wide range" , "range of tones" , "All the bands of colour seen in a rainbow" .)