Acolyte of a Swiss hero kept in place (9)
I believe the answer is:
satellite
'acolyte' is the definition.
(thesaurus)
'a swiss hero kept in place' is the wordplay.
'swiss hero' becomes 'tell' (I've seen this in another clue).
'kept in' means one lot of letters goes inside another.
'place' becomes 'site' (synonyms).
'a'+'tell'='atell'
'atell' going inside 'site' is 'SATELLITE'.
'of' is the link.
(Other definitions for satellite that I've seen before include "outpost" , "sidekick" , "Lackey" , "Moon" , "Orbiter of planet" .)