Present extremely silly and contrary opinion (6)
I believe the answer is:
heresy
'contrary opinion' is the definition.
'present extremely silly' is the wordplay.
'present' becomes 'here' (both can mean in attendance).
'extremely' suggests removing the centre.
'silly' with its centre removed is 'sy'.
'here'+'sy'='HERESY'
'and' acts as a link.
(Other definitions for heresy that I've seen before include "Unorthodoxy - apostasy" , "you shouldn't believe it" , "Heterodoxy" , "Blasphemy" , "Doctrine at variance with the orthodox position" .)