Ointment line displayed in store (5)
I believe the answer is:
salve
'ointment' is the definition.
(I know that ointment can be written as salve)
'line displayed in store' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'displayed in' indicates putting letters inside.
'store' becomes 'save' (save can mean to store or keep).
'l' put into 'save' is 'SALVE'.
(Other definitions for salve that I've seen before include "Ointment for wounds" , "Ointment from the vales" , "Laves with soothing stuff" , "Soothing ointment - may also be applied to feelings" , "healer" .)