Man to bounce up and down (3)
I believe the answer is:
bob
I believe this clue is a double definition.
'man' is the first definition.
(short for Robert)
'bounce up and down' is the second definition.
(I've seen this in another clue)
'to' is the link.
(Other definitions for bob that I've seen before include "money once" , "Move up and down like Robert" , "Pre-decimal coin" , "Short haircut for an old shilling?" , "line of verse" .)