It may well be lost in the operations room! (13)
I believe the answer is:
consciousness
'it may well be lost in the operations room' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
Can you help me to learn more?
(Other definitions for consciousness that I've seen before include "Self-awareness" , "State of being aware" , "Mental awareness" , "State of awareness" , "Intuition, perception" .)