Dad's brother receives article that's dirty (7)
I believe the answer is:
unclean
'that's dirty' is the definition.
(associated in meaning)
'dad's brother receives article' is the wordplay.
I cannot really understand how this works, but
'brother' could be 'uncle' (I have seen 'Brother of parent ' mean 'uncle' so perhaps 'brother' could also mean 'uncle') and 'uncle' is present in the answer.
'article' could be 'an' (indefinite article) and 'an' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for unclean that I've seen before include "Dirty, ritually impure" , "Dirty, needs a wash" , "Infected" , "Dirty; immoral" , "Ceremonially impure" .)