Owner, for one, taken in by erroneous report (10)
I believe the answer is:
proprietor
'owner' is the definition.
(I know that owner can be written as proprietor)
'for one taken in by erroneous report' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'one' becomes 'i' (Roman numeral).
'taken in by' indicates putting letters inside.
'erroneous' indicates an anagram.
'report' is an anagram of 'pretor'.
'i' going into 'pretor' is 'prietor'.
'pro'+'prietor'='PROPRIETOR'
(Other definitions for proprietor that I've seen before include "Business owner" , "Landlord" .)