I butt flipping soprano to get foreign capital (5)
I believe the answer is:
tunis
'foreign capital' is the definition.
(capital of Tunisia)
'i butt flipping soprano' is the wordplay.
'butt' becomes 'nut' (nut can mean to headbutt someone).
'flipping' is a reversal indicator.
'soprano' becomes 's' (musical abbreviation).
'i'+'nut'='inut'
'inut' in reverse letter order is 'tuni'.
'tuni'+'s'='TUNIS'
'to get' is the link.
(Other definitions for tunis that I've seen before include "Carthage lies near this N. African city" , "Tom, Dick or Harry" , "Capital of a republic in north Africa" , "I stun (anag) - port and capital" , "North African port and capital" .)