Trouble the escapee is in for, having leaped over the wall? (4,4)
I believe the answer is:
high jump
'trouble' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for high jump that I've seen before include "get a severe punishment" , "Athletics event (for those being punished?)" , "Bound" , "Field event" , "If one's for this, it's unfortunate" .)