Suspend band on radio (6)
I believe the answer is:
freeze
'suspend' is the definition.
(synonyms)
'band on radio' is the wordplay.
'band' becomes 'frieze' (I have seen 'Decorative band ' mean 'frieze' so perhaps 'band' could also mean 'frieze').
'on radio' shows a homophone (sound like).
'frieze' is a homophone of 'FREEZE'.
(Other definitions for freeze that I've seen before include "Render very cold" , "Harden into ice" , "Chill, sounds like decorative band" , "Hold at fixed level - say prices" , "Stand motionless" .)