The most common and most likely answer to this crossword clue is the 3 plus 2 letter word ICE UP
I've seen this crossword clue in The Daily Telegraph
I
C
E
U
P
More clues leading to the result ICE UP
- Cup-tie abandoned, dropping temperature causing freeze
- Freeze half-portions of choice soup
- Freeze alloy with metals to make time capsule
- Yes, drink is said to get very cold
- Turning puce, I freeze over
- Occasionally, ditches in a higher place freeze over
- I put last of minestrone in vessel to freeze
- Single container must cover end of wage freeze
- I drink noisily and get subjected to glacial reaction
- Become frosty when India gets trophy, overwhelming England
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.