Solution to Krypton 89

Today's clue:
A process to get Oxygen, Boron and a circle around a planet lacking core (9) 
Its solution:  BREATHING =  B  RING  EA (R) TH

Solved by the following 7 persons:

1) 6:04:06    Ravi Subramanian
2) 6:19:14    Ambika
3) 6:41:08    R.Narayanan
4) 7:09:02    Siddhan Subramanian
5) 7:21:24    S P Suresh
6) 7:24:34    Srivina
7) 8:12:53    Kesavan