Totally dismissed just claim (8)
I believe the answer is:
outright
'totally' is the definition.
(I've seen this before)
'dismissed just claim' is the wordplay.
'dismissed' becomes 'out' (I've seen this before).
'just claim' becomes 'right' (as in a legal right in the justice system).
'out'+'right'='OUTRIGHT'
(Other definitions for outright that I've seen before include "Clear" , "Completely - immediately" , "Not qualified" , "Without qualification" , "Openly and frankly" .)