Some bound off, being free (4)
I believe the answer is:
undo
'free' is the definition.
(I've seen this before)
'some bound off being' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'UNDO' is hidden in the letters of 'bound off being'.
(Other definitions for undo that I've seen before include "Open buttons or ruin" , "Bring to ruin" , "Reverse effect of" , "Ruin or loosen ties" , "Ruin, destroy" .)