A bed is unmade? That's not fair! (6)
I believe the answer is:
biased
'not fair' is the definition.
(I've seen this before)
'a bed is unmade?' is the wordplay.
'a bed is' can be anagrammed to 'BIASED'.
But, I'm unsure how the anagram is indicated.
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for biased that I've seen before include "Having prejudice" , "Prejudiced or influenced in favour or against" , "Prejudiced or partisan" , "Favouring one person or side over another" , "not fair" .)