Crossword Genius

Lost a pile of snow (6)

Ross

I believe the answer is:

adrift

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Daily Mail.
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