I'd see Don unexpectedly being unfair (3-5)
I believe the answer is:
one-sided
'unfair' is the definition.
(I've seen this before)
'i'd see don unexpectedly' is the wordplay.
'unexpectedly' is an anagram indicator.
'id'+'see'+'don'='idseedon'
'idseedon' is an anagram of 'ONE-SIDED'.
'being' acts as a link.
(Other definitions for one-sided that I've seen before include "Partial" , "Unfair or uneven" , "Unfair or partisan - single dimension?" , "So denied being unfair or biased" , "Grossly unequal; biased" .)