Brown before church on Sunday gives opinion (6)
I believe the answer is:
stance
'opinion' is the definition.
(thesaurus)
'brown before church on sunday' is the wordplay.
'brown' becomes 'tan' (tan is a kind of brown**).
'before' is a charade indicator (letters next to each other).
'church' becomes 'ce' (abbreviation for Church of England).
'on' says to put letters next to each other.
'sunday' becomes 's'.
'tan'+'ce' is 'tance'.
'tance' put after 's' is 'STANCE'.
'gives' is the link.
(Other definitions for stance that I've seen before include "Batsman's position" , "Position of the body or an attitude" , "Pose, for a golfer say" , "a driver may take on course" , "Standpoint" .)