Quiet shame follows United getting arrogant (6)
I believe the answer is:
uppity
'arrogant' is the definition.
(I've seen this in another clue)
'quiet shame follows united' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'shame' becomes 'pity' (synonyms).
'follows' is a charade indicator (letters next to each other).
'united' becomes 'U' (abbreviation).
'p'+'pity'='ppity'
'ppity' put after 'u' is 'UPPITY'.
'getting' is the link.
(Other definitions for uppity that I've seen before include "'Self-important, overweening (6)'" , "Cheeky or presumptuous" , "Informally pert or arrogant" , "Informally presumptuous or self-important" , "Full of oneself" .)