Fairly small-minded? About right (6)
I believe the answer is:
pretty
'fairly' is the definition.
(thesaurus)
'small-minded? about right' is the wordplay.
'small-minded?' becomes 'petty' ('petty' can be a synonym of 'small-minded').
'about' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'petty' enclosing 'r' is 'PRETTY'.
(Other definitions for pretty that I've seen before include "Fairly; appealing" , "Film with Julia Roberts (belle)" , "Nice to look at" , "Delicately attractive" , "Pleasing on the eye" .)