Uproar greeted upcoming trial (7)
I believe the answer is:
tempest
'uproar' is the definition.
(I've seen this before)
'greeted upcoming trial' is the wordplay.
'greeted' becomes 'met' (meet can mean to greet or receive).
'upcoming' shows that the letters should be reversed in order.
'trial' becomes 'pest' (both can mean an annoying person).
'met' back-to-front is 'tem'.
'tem'+'pest'='TEMPEST'
(Other definitions for tempest that I've seen before include "Violent storm (created by Shakespeare?)" , "Shakesperian storm" , "Furore" , "violent uproar" , "Wild storm" .)