Love morning time on the radio (5)
I believe the answer is:
amour
'love' is the definition.
(thesaurus)
'morning time on the radio' is the wordplay.
'morning' becomes 'am'.
'time' becomes 'hour' (hour is a kind of time).
'on the radio' shows a homophone (sound like).
'hour' sounds like 'our'.
'am'+'our'='AMOUR'
(Other definitions for amour that I've seen before include "20 [AFFAIR]" , "Love-affair" , "Fling" , "Affaire" , "Result of Cupid's darts" .)