Reached a teetotaller, one taking Enid out (8)
I believe the answer is:
attained
'reached' is the definition.
('attain' can be a synonym of 'reach')
'a teetotaller one taking enid out' is the wordplay.
'teetotaller' becomes 'tt' (abbreviation).
'one' becomes 'a'.
'taking' is a charade indicator (letters next to each other).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'enid' anagrammed gives 'ined'.
'a'+'tt'+'a'+'ined'='ATTAINED'
(Other definitions for attained that I've seen before include "Reached a goal" , "Accomplished, achieved" , "Reached (eg, age)" , "Reached with effort" .)