Cry when leaping damaged minor ego (8)
I believe the answer is:
geronimo
'cry when leaping' is the definition.
(you might shout 'Geronimo!' before jumping)
'damaged minor ego' is the wordplay.
'damaged' indicates an anagram.
'minor'+'ego'='minorego'
'minorego' anagrammed gives 'GERONIMO'.
(Other definitions for geronimo that I've seen before include "shout during dive" , "battle cry" , "[APACHE] leader" , "exhilarated cry" , "cry from bungee jumper?" .)