Los Angeles has put in for foreign capital (5)
I believe the answer is:
lhasa
'foreign capital' is the definition.
(I've seen this before)
'los angeles has put in' is the wordplay.
'los angeles' becomes 'LA' (abbreviation).
'put in' indicates putting letters inside.
'la' going around 'has' is 'LHASA'.
'for' is the link.
(Other definitions for lhasa that I've seen before include "Sacred city" , "Luxembourg's a" , "foreign capital" , "Tibetan holy city" , "The Forbidden City in Tibet" .)