Having a scholarly manner (like Trump?) (7)
I believe the answer is:
donnish
'having a scholarly manner' is the definition.
(don can mean an academic - especially at Oxbridge)
'like trump?' is the wordplay.
I cannot quite understand how this works, but
'like' could be 'ish' (similar in meaning) and 'ish' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for donnish that I've seen before include "Lecturer probably is" , "Scholarly" , "Typical of lecturer" , "Resembling academic" , "Like a college teacher" .)