Involved in non-conformism, I would ... be this? (9)
I believe the answer is:
dissident
'this?' is the definition.
The definition suggests a singular noun which matches the answer.
'involved in non-conformism i would' is the wordplay.
'involved in' means one lot of letters goes inside another.
'non-conformism' becomes 'dissent' (dissent from conformity).
'i would' becomes 'I'd'.
'dissent' going around 'id' is 'DISSIDENT'.
'be' acts as a link.
(Other definitions for dissident that I've seen before include "Opposer of officialdom" , "Rebel, protestor" , "One opposed to official policy" , "Insets did for one who opposes authority" , "One opposing official policy" .)