Last of hare sprang and ran off (6)
I believe the answer is:
eloped
'ran off' is the definition.
('elope' can be a synonym of 'run off')
'last of hare sprang' is the wordplay.
'last of' says to take the final letters.
'sprang' becomes 'loped' (I can't explain this - if you can you should give a lot more credence to this answer).
The last letter of 'hare' is 'e'.
'e'+'loped'='ELOPED'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for eloped that I've seen before include "Went off" , "Ran away to marry" , "Ran away to get married" .)