Herb's independent about church (8)
I believe the answer is:
basilica
'church' is the definition.
(basilica is a kind of church)
'herb's independent' is the wordplay.
'herb' becomes 'basil' (basil is a kind of herb).
'independent' becomes 'ica' (I can't justify this - if you can you should believe this answer much more).
'basil'+'ica'='BASILICA'
'about' is the link.
Can you help me to learn more?
(Other definitions for basilica that I've seen before include "Roman-style church" , "Bails CIA out of the large church" , "Church edifice" , "A large Christian church with two rows of columns (8)" , "Roman Catholic cathedral with special privileges" .)