Observer supporting smashing dish (4-6)

'dish' is the definition.
(dish can mean a good-looking person)

'observer supporting smashing' is the wordplay.
'observer' becomes 'looker' (someone observing things).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'smashing' becomes 'good' (similar in meaning).
'looker' put after 'good' is 'GOOD-LOOKER'.