A lot of mutinous old heads (8)
I believe the answer is:
shedload
'a lot' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'mutinous old heads' is the wordplay.
'mutinous' indicates an anagram.
'old'+'heads'='oldheads'
'oldheads' anagrammed gives 'SHEDLOAD'.
'of' is the link.
Can you help me to learn more?
(Other definitions for shedload that I've seen before include "Myriad" , "a ton" , "Lots - old heads (anag)" , "a lot of it" , "legion" .)