Like many Pride Parade participants (3)
I believe the answer is:
gay
'like many pride parade participants' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gay that I've seen before include "Writer of The Beggar's Opera" , "Light-hearted, carefree" , "Brightly coloured" , "John --, author of 'The Beggar's Opera'" , "Merry" .)