Swiss location's extremely tolerable home for composer (9)
I believe the answer is:
bernstein
'composer' is the definition.
(Leonard Bernstein)
'swiss location's extremely tolerable home' is the wordplay.
'swiss location's' becomes 'berns' (Swiss city).
'extremely' means to remove the middle letters.
'home' becomes 'in' ('he's home' can mean 'he's in').
'tolerable' with its middle removed is 'te'.
'berns'+'te'+'in'='BERNSTEIN'
'for' acts as a link.
(Other definitions for bernstein that I've seen before include "composer" , "Leonard --, US conductor" , "Leonard --, American conductor" , "Mass producer" , "scoring ace" .)