Snub idea that's crazy? That's fair (8)
I believe the answer is:
unbiased
'fair' is the definition.
('unbiased' can be similar in meaning to 'fair')
'snub idea that's crazy?' is the wordplay.
'that's crazy?' is an anagram indicator (I've seen 'crazy' mean this).
'snub'+'idea'='snubidea'
'snubidea' with letters rearranged gives 'UNBIASED'.
'that's' acts as a link.
(Other definitions for unbiased that I've seen before include "fair" , "Not prejudiced or partisan" , "Not prejudiced or influenced" , "Not partial or prejudiced" , "Not favouring one side or the other" .)