March in parade, monotonous (4)
I believe the answer is:
demo
'march' is the definition.
(as in a demonstration)
'in parade monotonous' is the wordplay.
'in' says the answer is hidden in the clue.
'DEMO' can be found hidden inside 'parade monotonous'.
(Other definitions for demo that I've seen before include "presentation" , "Political protest" , "March (abbr)" , "exhibit" , "Eg, protest march" .)