The meaning of a pile of snow (5)
I believe the answer is:
drift
This clue could be a double definition.
'the meaning' is the first definition.
(drift is a kind of meaning)
'pile of snow' is the second definition.
'drift' can be an answer for 'pile' (thesaurus). I am not sure about the 'of snow' bit.
'of a' is the link.
Can you help me to learn more?
(Other definitions for drift that I've seen before include "Slide" , "See 8" , "Float along; heap of snow" , "Gist - snow" , "Coast" .)