Majority gets homework - none cared to revise (13)
I believe the answer is:
preponderance
'majority' is the definition.
(thesaurus)
'homework none cared to revise' is the wordplay.
'homework' becomes 'prep' (synonyms).
'to revise' indicates an anagram.
'none'+'cared'='nonecared'
'nonecared' with letters rearranged gives 'onderance'.
'prep'+'onderance'='PREPONDERANCE'
'gets' is the link.
(Other definitions for preponderance that I've seen before include "Superior number" , "The lion's share" , "Dominance" , "In majority of" , "Predominance" .)