The Tory won after a landslide? Remarkable! (10)
I believe the answer is:
noteworthy
'remarkable' is the definition.
(I know that remarkable can be written as noteworthy)
'the tory won after a landslide?' is the wordplay.
'the tory won' can be anagrammed to 'NOTEWORTHY'.
But, I am not clear how this is indicated.
Can you help me to learn more?
(Other definitions for noteworthy that I've seen before include "Signal" , "important" , "Interesting, significant" , "Of significance" .)