Lively embraces providing calm (6)
I believe the answer is:
Here is my best explanation:
'calm' is the definition.
(pacifying is a kind of calming)
'lively embraces providing' is the subsidiary indication.
'lively' becomes 'pacy'.
'embraces' is an insertion indicator.
'providing' becomes 'if' (I've seen this in other clues).
'pacy' placed around 'if' is 'pacify'.
(Other definitions for pacify that I've seen before include "Make calm, appease", "Make calmer", "Calm", "In calm", "Soothe - appease", "Placate, calm", "Appease - subdue", "Quieten", "Quell the anger of" and "Bring peace to (a place)".)