Military Cross announced for host (5)
I believe the answer is:
emcee
'host' is the definition.
(synonyms)
'military cross announced' is the wordplay.
'military cross' becomes 'mc'.
'announced' indicates a 'sounds like' (homophone) clue.
'mc' sounds like 'EMCEE'.
'for' is the link.
(Other definitions for emcee that I've seen before include "Presenter" , "Someone presenting" , "Announcer" , "show director" , "MC" .)