We're wrong about a certain point, so start again (5)
I believe the answer is:
renew
'start again' is the definition.
(to renew something is to start it again)
'we're wrong about a certain point' is the wordplay.
'wrong' indicates an anagram.
'about' is an insertion indicator.
'a certain point' becomes 'n' (N is an example. I am not sure about the 'certain' bit.).
'were' is an anagram of 'reew'.
'reew' going around 'n' is 'RENEW'.
'so' is the link.
Can you help me to learn more?
(Other definitions for renew that I've seen before include "Repeat for next year" , "Establish again" , "Extend eg library loan" , "Extend loan period" , "Update library book, acquaintance, etc" .)