Back in Quebec, I bore an amniocentesis without needing oxygen (9)
I believe the answer is:
anaerobic
'without needing oxygen' is the definition.
'back in quebec i bore an amniocentesis' is the wordplay.
'back' says the letters should be written in reverse.
'in' says the answer is hidden in the clue.
'ciboreana' can be found hidden inside 'quebec i bore an amniocentesis'.
'ciboreana' reversed gives 'ANAEROBIC'.
(Other definitions for anaerobic that I've seen before include "lacking in inspiration?" , "functional without O2" .)