He falls on his enemies (11)
I believe the answer is:
parachutist
'falls on his enemies' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he' is the wordplay.
I cannot quite see how this works, but
'he' could be 'ara' and 'ara' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for parachutist that I've seen before include "Skydiver" , "Fellow who may be down to earth" , "One making a controlled descent" .)