Deposit a jacket and hood (5)

I believe the answer is:

parka

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

'jacket and hood' is the definition.
I can't judge whether this defines the answer.

'deposit a' is the wordplay.
'deposit' becomes 'park' (I can't explain this - if you can you should believe this answer much more).
'park'+'a'='PARKA'

Can you help me to learn more?

(Other definitions for parka that I've seen before include "weatherproof cover" , "Hooded warm jacket" , "Kind of heavy jacket" , "Warm, hooded coat" , "Hooded weatherproof coat" .)

I've seen this clue in The Globe and Mail.

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