The most common and most likely answer to this crossword clue is the 10 letter word ABOMINABLE
I've seen this crossword clue in Independent
A
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More clues leading to the result ABOMINABLE
- Offensive President, out on a limb, to be contained
- A snowman can be so hateful?
- A mobile ban – fantastic or awful?
- Still one creates another name for such a snowman
- Appalling prohibition I’m lifting, filling a trunk
- Odious sailors, the latter disrupting oilmen working
- Very bad, a mobile ban all over the place
- Offensive description of a snowman?
- Horrid seaman, having no time with his kind…
- Beastly snowman as described in Nepal possibly
Buddy explains!

The straight part
We know that "such a snowman" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case such a snowman = abominable.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 ABOMINABLE mean?
ABOMINABLE adjective- Worthy of, or causing, abhorrence, as a thing of evil omen; odious in the utmost degree; very hateful; detestable; loathsome; execrable.
- Excessive, large (used as an intensifier).
- Very bad or inferior.
- Disagreeable or unpleasant.