Cool when shaking dice (4)
I believe the answer is:
iced
'cool' is the definition.
(similar in meaning)
'shaking dice' is the wordplay.
'shaking' is an anagram indicator.
'dice' anagrammed gives 'ICED'.
'when' acts as a link.
(Other definitions for iced that I've seen before include "Chilled - killed" , "Glazed" , "Covered with flavoured sugar topping" , "What cake might be" , "Kept cool" .)