How stupid procuring flipping business gadget (6)
I believe the answer is:
doodah
'gadget' is the definition.
'how stupid procuring flipping business' is the wordplay.
'how stupid' becomes 'doh' (I've seen this before).
'procuring' means one lot of letters goes inside another.
'flipping' says the letters should be written backwards.
'business' becomes 'ado' (both can mean happenings or commotion).
'ado' reversed gives 'oda'.
'doh' enclosing 'oda' is 'DOODAH'.
(Other definitions for doodah that I've seen before include "Object when someone forgets" , "Thingummy" , "Whatsit" , "Thingamy" , "Whatchamacallit, thingamajig" .)