Front men on the radio? (5)
I believe the answer is:
guise
'front' is the definition.
(thesaurus)
'men on the radio?' is the wordplay.
'men' becomes 'guys' (guy can informally mean a man).
'on the radio?' indicates a 'sounds like' (homophone) clue (I've seen 'on the radio' mean this).
'guys' is a homophone of 'GUISE'.
(Other definitions for guise that I've seen before include "Mask" , "Show" , "Appearance, semblance" , "Semblance; likeness" , "Demeanour" .)