Nailed down (4)
'nailed down' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for iced that I've seen before include "Kept cool" , "Frozen, chilled" , "Dressed in a sweet coat" , "Covered with flavoured sugar topping" , "Ultra-cold" .)
'nailed down' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for set that I've seen before include "(Of the sun) drop below the horizon" , "Put down the group of games" , "What the Sun regularly does" , "Arrange; a party" , "Become fixed or solid" .)