The upset, I see, is related to morality (5)
I believe the answer is:
ethic
'morality' is the definition.
(I've seen this in another clue)
'the upset i see' is the wordplay.
'upset' indicates anagramming the letters.
'see' becomes 'C' (the word for the letter, according to Chambers).
'the' is an anagram of 'eth'.
'eth'+'i'+'c'='ETHIC'
'is related to' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for ethic that I've seen before include "Set of moral values" , "Moral code" , "Moral practice" , "type of behaviour" , "set of morals" .)