Era of pageantry (3)
I believe the answer is:
age
'era' is the definition.
(thesaurus)
'of pageantry' is the wordplay.
'of' indicates the answer is hidden within the clue.
'AGE' is hidden within 'pageantry'.
(Other definitions for age that I've seen before include "Years lived so far" , "Plenty of time" , "Years since birth" , "Maturity" , "Turkish commander" .)