Obscene, indecent (4)
I believe the answer is:
lewd
I believe this clue is a double definition.
'obscene' is the first definition.
(I know that obscene can be written as lewd)
'indecent' is the second definition.
(synonyms)
(Other definitions for lewd that I've seen before include "Dirty" , "suggestive manner" , "Obscene, indecent" , "Bawdy" , "Obscene - lustful - sensual" .)