The most common and most likely answer to this crossword clue is the 8 letter word ICE-COLD
I've seen this crossword clue in The Guardian
I
C
E
-
C
O
L
D
Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ICE-COLD mean?
ICE-COLD adjective- As cold as ice; very cold.
- Without emotion; distant.