Rather small-minded Republican brought in (6)
I believe the answer is:
pretty
'rather' is the definition.
('pretty' can be a synonym of 'rather')
'small-minded republican brought in' is the wordplay.
'small-minded' becomes 'petty' ('petty' can be a synonym of 'small-minded').
'republican' becomes 'r' (abbreviation).
'brought in' means one lot of letters goes inside another.
'petty' placed around 'r' is 'PRETTY'.
(Other definitions for pretty that I've seen before include "Facially attractive" , "Fairly; attractive" , "Film with Julia Roberts (belle)" , "Nice to look at" , "Pleasing to look at" .)