Jumps around with much pleasure (5)
I believe the answer is:
leaps
'jumps' is the definition.
('leap' can be a synonym of 'jump')
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for leaps that I've seen before include "Jumps or springs suddenly" , "Makes fast progress - by . . . . . and bounds" , "Pales in vaults" , "Jumps or bounds" , "Pales (anag.)" .)