Leave, following being involved in error (2,3)
I believe the answer is:
go off
'leave' is the definition.
(thesaurus)
'following being involved in error' is the wordplay.
'following' becomes 'f' (used when citing page numbers etc).
'being involved in' is an insertion indicator.
'error' becomes 'goof' (I've seen this before).
'f' put within 'goof' is 'GO-OFF'.
(Other definitions for go off that I've seen before include "Decay - become disenchanted with" , "fall asleep" , "Rot; leave" , "Turn" , "discharged" .)