Using one short skewer, upset an arrangement of blooms (7)
I believe the answer is:
ikebana
'arrangement of blooms' is the definition.
'ikebana' can be an answer for 'arrangement' (I've seen this before). I'm not sure about the 'of blooms' bit.
'using one short skewer upset an' is the wordplay.
'using one' becomes 'i' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'short' means to remove the last letter.
'skewer' becomes 'kebab' (I've seen this before).
'upset' says the letters should be written in reverse.
'an' reversed gives 'na'.
'kebab' with its final letter taken off is 'keba'.
'i'+'keba'+'na'='IKEBANA'
Can you help me to learn more?
(Other definitions for ikebana that I've seen before include "craft" , "Japanese occupation" , "Japanese flower-arranging art" , "exhibiting array of bloomers" , "Artfully fixing bloomers" .)