Principal of university accessing revolving door, so fragrant (7)
I believe the answer is:
odorous
'fragrant' is the definition.
(similar in meaning)
'principal of university accessing revolving door so' is the wordplay.
'principal of' says to take the initial letters.
'accessing' indicates putting letters inside (inserted letters gain access).
'revolving' indicates an anagram (letters turning or twisting around).
The first letter of 'university' is 'u'.
'door'+'so'='doorso'
'doorso' with letters rearranged gives 'odoros'.
'u' inserted inside 'odoros' is 'ODOROUS'.
(Other definitions for odorous that I've seen before include "Scented" , "Having a scent" , "Giving off a smell" , "Fragrant" , "having a distinct aroma" .)