Achieve the correct balance with the ornamentation (4)
I believe the answer is:
trim
'ornamentation' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for trim that I've seen before include "Prune - spruce" , "(Make) neat and tidy" , "To change views expediently" , "properly organised" , "Pare; in good order" .)