Sweet host has a point about icon (7)
I believe the answer is:
melodic
'sweet' is the definition.
(similar in meaning)
'host has a point about icon' is the wordplay.
'host' becomes 'mc' (short for Master of Ceremonies).
'has' is an insertion indicator.
'a point' becomes 'e' (compass point).
'about icon' becomes 'lodi' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'e'+'lodi'='elodi'
'mc' going around 'elodi' is 'MELODIC'.
Can you help me to learn more?
(Other definitions for melodic that I've seen before include "Pleasant to listen to" , "Harmonious" , "nice on the ear" , "Pleasant-sounding" , "Pleasantly musical" .)