Down payment made before Golden Treasury finally appears in store (10)

I believe the answer is:

depository

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'store' is the definition.
(I've seen this before)

'down payment made before golden treasury' is the wordplay.
'down payment' becomes 'deposit' (synonyms).
'made before golden treasury' becomes 'ory' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'deposit'+'ory'='DEPOSITORY'

'finally appears in' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for depository that I've seen before include "Storage place" , "maybe safe" , "housed here" , "store" .)

I've seen this clue in The Telegraph.

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