Do some boxing! (6)
I believe the answer is:
encase
'do' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how one could define the other.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for encase that I've seen before include "Cover completely" , "Enclose, cover" , "Frame" , "Wrap" , "Cover with close-fitting surround" .)