Attitude that is not heartless evident in speech (11)
I believe the answer is:
orientation
'attitude' is the definition.
(orientation is a kind of attitude)
'that is not heartless evident in speech' is the wordplay.
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'heartless' says to hollow out the word (remove centre letters).
'evident in' indicates putting letters inside.
'speech' becomes 'oration' (oration is a kind of speech).
'not' with its centre removed is 'nt'.
'ie'+'nt'='ient'
'ient' going into 'oration' is 'ORIENTATION'.
(Other definitions for orientation that I've seen before include "Tendency" , "Basic preferences" , "Relative position" .)