Clarify opposition viewpoint abandoned by Society (11)
I believe the answer is:
disentangle
'clarify' is the definition.
(I've seen this before)
'opposition viewpoint abandoned by society' is the wordplay.
'opposition' becomes 'dissent' (I've seen this in another clue).
'viewpoint' becomes 'angle' (angle is a kind of viewpoint).
'abandoned by' suggests deleting specific letters.
'society' becomes 's' (common abbreviation in names of organisations).
'dissent'+'angle'='dissentangle'
'dissentangle' with 's' taken out is 'DISENTANGLE'.
(Other definitions for disentangle that I've seen before include "Untwist" , "Straighten" , "free" , "Decipher" , "Unravel" .)