Field event broadcast live in January (7)
I believe the answer is:
javelin
'field event' is the definition.
(javelin is a kind of field event)
'broadcast live in january' is the wordplay.
'broadcast' indicates anagramming the letters (letters scattered or cast around).
'in' indicates putting letters inside.
'january' becomes 'Jan' (synonyms).
'live' anagrammed gives 'veli'.
'veli' put inside 'jan' is 'JAVELIN'.
(Other definitions for javelin that I've seen before include "Spear for throwing" , "Type of spear" , "Field event projectile" , "Long spear" , "It's thrown in a field event" .)