Caught in dismay orotund dignitary (5)
I believe the answer is:
'dignitary' is the definition.
(I've seen this before)
'caught in dismay orotund' is the wordplay.
'caught in' indicates the answer is hidden within the clue.
'MAYOR' is hidden within 'dismay orotund'.
(Other definitions for mayor that I've seen before include "Local dignitary" , "Corporation head" , "Officer" , "Johnson, say" , "For example, Henchard" .)