Steward, soldier and medic hosting party (5-4)
I believe the answer is:
major-domo
'steward' is the definition.
'soldier and medic hosting party' is the wordplay.
'soldier' becomes 'major' (major is a military rank).
'and' is a charade indicator (letters next to each other).
'medic' becomes 'mo' (medical officer).
'hosting' indicates putting letters inside (inserted letters are welcomed in or hosted).
'party' becomes 'do' (do is a kind of party).
'major'+'mo'='majormo'
'majormo' placed around 'do' is 'MAJOR-DOMO'.
(Other definitions for major-domo that I've seen before include "Household official" , "Chief steward or butler of a household" , "General steward" , "Chief steward of a great household" .)