Marks exercises during exam, causing uproar (7)
I believe the answer is:
tempest
'uproar' is the definition.
(thesaurus)
'marks exercises during exam' is the wordplay.
'marks' becomes 'm' (former German currency).
'exercises' becomes 'pe'.
'during' means one lot of letters goes inside another.
'exam' becomes 'test' ('test' can be a synonym of 'exam').
'm'+'pe'='mpe'
'mpe' put inside 'test' is 'TEMPEST'.
'causing' is the link.
(Other definitions for tempest that I've seen before include "Cyclone" , "Play (with rough weather)" , "Shakespeare play with storm scene" , "Outburst" , "terrible blow" .)