Nothing right with transactions -- distressing experiences (7)
I believe the answer is:
ordeals
'distressing experiences' is the definition.
(an ordeal is a distressing or harrowing experience)
'nothing right with transactions' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'right' becomes 'R' (common abbreviation).
'with' means one lot of letters go next to another.
'transactions' becomes 'deals' (deal is a kind of transaction).
'o'+'r'+'deals'='ORDEALS'
(Other definitions for ordeals that I've seen before include "Trying experiences" , "Difficult experiences, hard times" , "Tribulations" , "Testing experiences" , "difficult tests" .)