Lost a pile of snow (6)
I believe the answer is:
adrift
'lost' is the definition.
(thesaurus)
'a pile of snow' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
The remaining letters 'drift' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for adrift that I've seen before include "(Of ship) out of control" , "Undirected" , "Afloat without steerage" , "not settled" , "Aimlessly floating" .)