Security is lifted in the store (7)
I believe the answer is:
deposit
'security' is the definition.
(I know that deposit is a type of security)
'is lifted in the store' is the wordplay.
'lifted' says the letters should be written in reverse (going up in down clue).
'in the' indicates putting letters inside.
'store' becomes 'depot' (depot can mean a store or warehouse).
'is' reversed gives 'si'.
'si' placed inside 'depot' is 'DEPOSIT'.
(Other definitions for deposit that I've seen before include "Place" , "secure an item" , "Posited as down payment" , "Put down - initial payment" , "is one back on the bottle?" .)