The most common and most likely answer to this crossword clue is the 3 plus 4 letter word ICE FLOE
I've seen this crossword clue in The Daily Telegraph
I
C
E
F
L
O
E
More clues leading to the result ICE FLOE
- Traveller of low degree witches followed regularly
- Island athlete once rounding wild fell overlooking lake, hazard in wintry climes?
- Compiled eco file showing hazard in Arctic seas
- Occasionally, finches followed maritime feature
- Sheet that doesn’t stay put — it’s cold!
- Frozen sheet could make one feel cold around centre of abdomen
Buddy explains!

The straight part
We know that "hazard in Arctic seas" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hazard in arctic seas = ice floe.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 FLOE mean?
ICE FLOE noun- Any type of sea ice not attached to land, drift ice.
- An ice dam (ice jam), a blockage of ice in a river starting with an ice floe in the river.
- An ice stream (ice flow), a type of fast moving glacier
- A flat mass of floating ice, smaller than an ice field.