Hurry old fool on stage (4,2,2)
I believe the answer is:
step on it
'hurry' is the definition.
(thesaurus)
'old fool on stage' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'fool' becomes 'nit' (I've seen this before).
'on' is a charade indicator (letters next to each other).
'stage' becomes 'step' (I've seen this before).
'o'+'nit'='onit'
'onit' after 'step' is 'STEP ON IT'.
(Other definitions for step on it that I've seen before include "Get a move on!" , "Hurry up, put foot down on pedal" , "How might one kill an ant" , "Informally, hurry or drive faster" , "improve rate of advance" .)