At centre of group nothing is wasted (3,2,2)
I believe the answer is:
out of it
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for out of it that I've seen before include "Forlorn" , "Excluded from participation" , "Eliminated" , "is not included" , "Drunk < , unaware what is happening" .)