Deduces wrongly, led astray (7)
I believe the answer is:
seduced
'led astray' is the definition.
(I've seen this in another clue)
'deduces wrongly' is the wordplay.
'wrongly' is an anagram indicator.
'deduces' is an anagram of 'SEDUCED'.
(Other definitions for seduced that I've seen before include "Someone attracted to a belief" , "Beguiled" , "Led astray" , "Lured -- enticed" .)