Hidden store for Captain Smart? (5)

I believe the answer is:

cache

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'hidden store' is the definition.
(I've seen this in another clue)

'captain smart?' is the wordplay.
'captain' becomes 'c' (this could be a standard abbreviation of which I'm unaware).
'smart?' becomes 'ache' ('ache' can be a synonym of 'smart').
'c'+'ache'='CACHE'

'for' is the link.

Can you help me to learn more?

(Other definitions for cache that I've seen before include "Secret store of valuables" , "(Place in) hidden store" , "Collection of hidden things" , "Stockpile" , "memory" .)

I've seen this clue in the Sydney Morning Herald.

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