Question a piece of news that’s unduly slanted (5)
I believe the answer is:
askew
'unduly slanted' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives occasionally mean the same thing.
'question a piece of news' is the wordplay.
'question' becomes 'ask'.
'a piece of news' becomes 'ew' (I can't explain this - if you can you should believe this answer much more).
'ask'+'ew'='ASKEW'
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for askew that I've seen before include "Wakes (anag)" , "Crookedly" , "Off-centre" , "At an angle, 19 Down" , "Oblique" .)