Depart on one leg? (3,2)
I believe the answer is:
hop it
'depart' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'one leg?' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'leg?' could be 'hop' and 'hop' is present in the answer.
A single letter 't' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'on' acts as a link.
Can you help me to learn more?
(Other definitions for hop it that I've seen before include "On your bike!" , "shove off" , "Scram!" , "get out quick!" , "split" .)