Capital arrangement of airs for the piano (5)
I believe the answer is:
paris
'capital' is the definition.
(Paris is the capital of France)
'arrangement of airs for the piano' is the wordplay.
'arrangement of' indicates an anagram.
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the piano' becomes 'p' (musical abbreviation).
'airs' anagrammed gives 'aris'.
'aris' put after 'p' is 'PARIS'.
(Other definitions for paris that I've seen before include "where he got plastered?" , "Capital of France" , "Old prince" , "French capital - Trojan prince" , "Prince of Troy - capital city" .)