Odious as a snowman (10)
I believe the answer is:
abominable
'odious' is the definition.
(synonyms)
'as a snowman' is the wordplay.
I cannot quite understand how this works, but
'as' could be 'in' (I've seen this in other clues) and 'in' is located in the answer.
'a' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for abominable that I've seen before include "Hateful" , "Odious" , "Very bad, terrible" , "Atrocious" , "Causing moral revulsion" .)