Title mostly covering every single coaching role (7)
I believe the answer is:
teacher
'single coaching role' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'title mostly covering every' is the wordplay.
'title mostly' becomes 'ter' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'covering' indicates putting letters inside.
'every' becomes 'each' (synonyms).
'ter' going around 'each' is 'TEACHER'.
Can you help me to learn more?
(Other definitions for teacher that I've seen before include "The trainer" , "CARRY ON FILM" , "Coach" , "Schoolmaster" , "The race (anag.)" .)