Fairly small-minded about Radio Head (6)
I believe the answer is:
pretty
'fairly' is the definition.
(I know that fairly can be written as pretty)
'small-minded about radio head' is the wordplay.
'small-minded' becomes 'petty' (synonyms).
'about' is an insertion indicator.
'radio head' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'petty' placed around 'r' is 'PRETTY'.
Can you help me to learn more?
(Other definitions for pretty that I've seen before include "Lovely" , "Film with Julia Roberts (belle)" , "Daintily good-looking, maybe as a picture" , "pulchritudinous" , "Fairly - good-looking" .)