Flower arranging embargo introduced by Swedish institution (7)
I believe the answer is:
ikebana
'flower arranging' is the definition.
(Japanese method of flower arranging)
'embargo introduced by swedish institution' is the wordplay.
'embargo' becomes 'ban' (a ban on trade).
'introduced by' indicates putting letters inside (some letters introduce others into them).
'swedish institution' becomes 'ikea' (I can't explain this - if you can you should believe this answer much more).
'ban' put inside 'ikea' is 'IKEBANA'.
Can you help me to learn more?
(Other definitions for ikebana that I've seen before include "Art of Japanese flower arrangement" , "craft" , "Flower arranging; In a bake (anag.)" , "arrangement of flowers" , "exhibiting array of bloomers" .)