Industry in OPEC areas reorganised (9)
I believe the answer is:
aerospace
'industry' is the definition.
(aerospace is an industry or area of business)
'opec areas reorganised' is the wordplay.
'reorganised' indicates an anagram.
'opec'+'areas'='opecareas'
'opecareas' with letters rearranged gives 'AEROSPACE'.
'in' acts as a link.
(Other definitions for aerospace that I've seen before include "Technology of planes, rockets, etc" , "Industry of flight" , "Branch of technology including aviation" , "zone near Earth" , "rocket industry" .)