Crossword Genius

Going down without head scarf is unseemly (8)

Ross

I believe the answer is:

indecent

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'is unseemly' is the definition.
(synonyms)

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(Other definitions for indecent that I've seen before include "Immodest, gross" , "not appropriate" , "Smutty" , "Gross, obscene" , "Lewd" .)

I've seen this clue in the Sydney Morning Herald.
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