Dismissed Tory there and then (8)
I believe the answer is:
outright
'there and then' is the definition.
'dismissed tory' is the wordplay.
'dismissed' becomes 'out' (I've seen this before).
'tory' becomes 'right' (I've seen this before).
'out'+'right'='OUTRIGHT'
(Other definitions for outright that I've seen before include "Without restriction or reservation" , "Immediately; openly" , "Completely and thoroughly" , "Not qualified" , "Directly; without reservation" .)