I see Ted's upset about this decree (5)
I believe the answer is:
edict
'this decree' is the definition.
(synonyms)
'i see ted's upset' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'upset' indicates an anagram.
'i'+'c'+'ted'='icted'
'icted' anagrammed gives 'EDICT'.
'about' is the link.
(Other definitions for edict that I've seen before include "Regulation" , "Pronouncement" , "Cited (anag) - proclamation" , "Injunction" , "Decree, order" .)