A lever’s changes are many (7)
I believe the answer is:
several
'many' is the definition.
(thesaurus)
'a lever's changes' is the wordplay.
'changes' indicates anagramming the letters.
'a'+'levers'='alevers'
'alevers' is an anagram of 'SEVERAL'.
'are' is the link.
(Other definitions for several that I've seen before include "Various, sundry" , "quite a lot" , "Sundry, distinct" , "three or four" , "Divers" .)