Flower arrangement in furniture shop to cover most of store (7)
I believe the answer is:
ikebana
'flower arrangement' is the definition.
(I know that flower arrangement can be written as Ikebana)
'furniture shop to cover most of store' is the wordplay.
'furniture shop' becomes 'IKEA' (IKEA is a furniture shop).
'to cover' is an insertion indicator.
'most of' means to remove the last letter.
'store' becomes 'bank' (I've seen this before).
'bank' with its last letter taken off is 'ban'.
'ikea' placed around 'ban' is 'IKEBANA'.
'in' acts as a link.
(Other definitions for ikebana that I've seen before include "Japanese flower-arranging art" , "formal display" , "craft" , "Art of Japanese flower arrangement" , "exhibiting array of bloomers" .)