University boss may find answer in study (4)
I believe the answer is:
Here is my best explanation:
'university boss' is the definition.
'answer in study' is the subsidiary indication.
'answer' becomes 'a' (abbreviation e.g. in Q&A).
'in' means one lot of letters goes inside another.
'study' becomes 'den' (I've seen this before).
'a' placed within 'den' is 'dean'.
'may find' is the link.
(Other definitions for dean that I've seen before include "Cathedral dignitary; head of university department", "Ice dancer", "Cathedral official", "College administrator", "Head of e.g. faculty", "college administrator", "Academic administrator", "Resident fellow", "Head of a university" and "Clergyman; narrow valley".)