This thus inhibiting business graduate? (7)
I believe the answer is:
embargo
'this' is the definition.
The definition suggests a singular noun which matches the answer.
'thus inhibiting business graduate?' is the wordplay.
'thus' becomes 'ergo' (I've seen this before).
'inhibiting' indicates putting letters inside.
'business graduate?' becomes 'mba' (Master of Business Administration degree).
'ergo' enclosing 'mba' is 'EMBARGO'.
(Other definitions for embargo that I've seen before include "Eg, Rambo? (anag)" , "Ban, veto" , "Commercial ban" , "Trade barrier or publication ban" , "restrict trade" .)