Render pardon for doing a bunk (4)
I believe the answer is:
give
'render' is the definition.
(giving is a kind of rendering)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for give that I've seen before include "Donate or hand over" , "Contribute - elasticity" , "Supply; elasticity" , "Offer, elasticity" , "There's lead" .)