Depository shooter used, almost shot (10)
I believe the answer is:
storehouse
'depository' is the definition.
(storehouse is a kind of depository)
'shooter used almost shot' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'shot' indicates an anagram.
'shooter'+'used'='shooterused'
'shooterused' with its last letter removed is 'shooteruse'.
'shooteruse' with letters rearranged gives 'STOREHOUSE'.
(Other definitions for storehouse that I've seen before include "Depository" , "vault" .)