Shows disapproval about our heartless lecturers (6)
I believe the answer is:
tutors
'lecturers' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps there's an association between them I don't understand?
'shows disapproval about our heartless' is the wordplay.
'shows disapproval' becomes 'tuts' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' indicates putting letters inside.
'heartless' suggests removing the centre.
'our' with its middle removed is 'or'.
'tuts' going around 'or' is 'TUTORS'.
Can you help me to learn more?
(Other definitions for tutors that I've seen before include "Teachers of individuals or small groups" , "Private teachers for students" , "Mentors" , "Private instructors" , "Coaches" .)