Assist, creating equilibrium (6)
I believe the answer is:
stasis
'equilibrium' is the definition.
(I've seen this before)
'assist creating' is the wordplay.
'creating' is an anagram indicator.
'assist' anagrammed gives 'STASIS'.
(Other definitions for stasis that I've seen before include "lack of activity" , "Total lack of movement" , "Assist with stagnant condition" , "Assist in state of stagnation" , "State of immobility or inactivity" .)