Retired? Time sure flies (8)
I believe the answer is:
emeritus
'retired?' is the definition.
('emeritus' can be a synonym of 'retired')
'time sure flies' is the wordplay.
'flies' is an anagram indicator.
'time'+'sure'='timesure'
'timesure' is an anagram of 'EMERITUS'.
(Other definitions for emeritus that I've seen before include "Keeping rank, retired" , "Retired but retaining a courtesy title" , "Title of one honourably retired from duty" , "Retiring academic" , "Use remit for retained title of retired professional" .)