Perfect balance (6)
I believe the answer is:
stasis
'perfect balance' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stasis that I've seen before include "Abnormal state in which the flow of blood is stopped" , "State of immobility or inactivity" , "Stoppage, arrest" , "Inactive state" , "Condition of arrested progress" .)