Maligned for being plastered! (7)
I believe the answer is:
smeared
'maligned' is the definition.
(I've seen this in another clue)
'being plastered' is the wordplay.
I cannot quite see how this works, but
'being' could be 'red' (red is a kind of being) and 'red' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for smeared that I've seen before include "Wiped across" , "Bedaubed" , "Daubed" .)