Possibly stirs up the pedants (7)
I believe the answer is:
purists
'the pedants' is the definition.
(purist is a kind of pedant)
'possibly stirs up' is the wordplay.
'possibly' indicates an anagram.
'stirs'+'up'='stirsup'
'stirsup' anagrammed gives 'PURISTS'.
(Other definitions for purists that I've seen before include "fastidious types" , "pedants" , "Pedantic folk" , "Sticklers for traditional rules" .)