Amid upset, share regard (10)
I believe the answer is:
admiration
'regard' is the definition.
(I have seen 'High regard' mean 'admiration' so perhaps 'regard' could also mean 'admiration')
'amid upset share' is the wordplay.
'upset' is an anagram indicator.
'share' becomes 'ration' (ration is a kind of share).
'amid' is an anagram of 'admi'.
'admi'+'ration'='ADMIRATION'
(Other definitions for admiration that I've seen before include "High regard, respect" , "Praise" , "warm approval" , "wonder" , "Veneration, esteem" .)