He’s on the edge! (5)
I believe the answer is:
cliff
'he's' is the definition.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cliff that I've seen before include "Sir - - Richard" , "-- Richard, singer" , "Precipice" , "A steep rock-face on coast" , "stony face?" .)