Firm hug can end upset (9)
I believe the answer is:
Here is my best explanation:
'firm' is the definition.
'hug can end upset' is the subsidiary indication.
'upset' is an anagram indicator.
'hugcanend' is an anagram of 'unchanged'.
(Other definitions for unchanged that I've seen before include "Not altered", "Remaining in an original state" and "Unaltered".)