Mention North American approaching East European by radio (9)
I believe the answer is:
namecheck
'mention' is the definition.
'north american approaching east european by radio' is the wordplay.
'north' becomes 'n' ('N' can be a synonym of 'north').
'american' becomes 'am' (abbreviation in some contexts).
'approaching east' becomes 'e' ('E' can be a synonym of 'east'. I am not sure about the 'approaching' bit.).
'european' becomes 'czech' (Czech is an example).
'by radio' shows a homophone (sound like) (how the word might sound on the radio).
'czech' is a homophone of 'check'.
'n'+'am'+'e'+'check'='NAMECHECK'
(Another definition for namecheck that I've seen is " to get some publicity".)