Got the wrong idea Adam is too kind at heart (7)
I believe the answer is:
mistook
'got the wrong idea' is the definition.
'adam is too kind at heart' is the wordplay.
'at heart' indicates a hidden word (letters hidden in the heart of the clue).
'MISTOOK' can be found hidden inside 'adam is too kind'.
(Other definitions for mistook that I've seen before include "Was wrong about (item)" , "Was wrong about (something)" .)