Cheer once drunk achieves balance (9)
I believe the answer is:
coherence
'achieves balance' is the definition.
I can't tell whether this defines the answer.
'cheer once drunk' is the wordplay.
'drunk' indicates an anagram.
'cheer'+'once'='cheeronce'
'cheeronce' anagrammed gives 'COHERENCE'.
Can you help me to learn more?
(Other definitions for coherence that I've seen before include "ability to talk sense" , "Logical consistency" , "union" , "sense of unity" , "Sticking together" .)