Dirty residence half scrubbed up (4)
I believe the answer is:
lewd
'dirty' is the definition.
(similar in meaning)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lewd that I've seen before include "Salacious" , "Sexually crude" , "Indecent, licentious" , "Obscene - lustful - sensual" , "Dirty" .)