Range of mushrooms about right to fill belly (8)
I believe the answer is:
spectrum
'range' is the definition.
(a spectrum is a range or variety)
'mushrooms about right to fill belly' is the wordplay.
'mushrooms about' becomes 'spec' (I can't justify this - if you can you should believe this answer much more).
'right' becomes 'r' (common abbreviation).
'to fill' indicates putting letters inside.
'belly' becomes 'tum' (I've seen this before).
'r' inserted within 'tum' is 'trum'.
'spec'+'trum'='SPECTRUM'
'of' is the link.
Can you help me to learn more?
(Other definitions for spectrum that I've seen before include "An entire range of related qualities of crumpets" , "Band of colours in the rainbow" , "The bands of colur as seen in rainbow" , "A broad range, of colours say" , "Bands of colour in crumpets" .)