Superior American performed in US city (2-2-2)
I believe the answer is:
la-di-da
'superior' is the definition.
'american performed in us city' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'performed' becomes 'did' ('do' can be a synonym of 'perform').
'in' is an insertion indicator.
'us city' becomes 'la'.
'a'+'did'='adid'
'adid' placed inside 'la' is 'LA-DI-DA'.
(Other definitions for la-di-da that I've seen before include "Informally, having affected manner of pronunciation" , "Affectedly genteel" , "Stuck-up" , "I'd a lad with affected manner or pronunciation" , "Hoity-toity" .)