A university teacher's about right to decorate (5)
I believe the answer is:
adorn
'decorate' is the definition.
('adorn' can be a synonym of 'decorate')
'a university teacher's about right' is the wordplay.
'university teacher' becomes 'don' (I've seen this before).
'about' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'don' placed around 'r' is 'dorn'.
'a'+'dorn'='ADORN'
'to' acts as a link.
(Other definitions for adorn that I've seen before include "dress" , "Bedeck" , "Make more attractive" , "Festoon" , "Attire" .)