Security is raised in store (7)
I believe the answer is:
deposit
'security' is the definition.
(deposit is a kind of security)
'is raised in store' is the wordplay.
'raised' shows that the letters should be reversed in order.
'in' indicates putting letters inside.
'store' becomes 'depot' ('depot' can be a synonym of 'store').
'is' written backwards gives 'si'.
'si' inserted within 'depot' is 'DEPOSIT'.
(Other definitions for deposit that I've seen before include "Lay down" , "Part payment on a purchase" , "Layer laid down" , "secure an item" , "store" .)