Animal jumping numerous hedges (3)
I believe the answer is:
gnu
'animal' is the definition.
(thesaurus)
'jumping numerous hedges' is the wordplay.
'hedges' indicates a hidden word (hedge can mean enclose).
'GNU' can be found hidden inside 'jumping numerous'.
(Other definitions for gnu that I've seen before include "Strange gun for an antelope" , "Large African antelope" , "Wildebeest" , "hitherto unknown, we hear" , "animals" .)