They come round once a week, unsettling us with arty ads (9)

I believe the answer is:

saturdays

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'they come round once a week' is the definition.
The definition suggests an adverb but the answer is not.

'unsettling us with arty ads' is the wordplay.
'unsettling' is an anagram indicator.
'with' is a charade indicator (letters next to each other).
'arty'+'ads'='artyads'
'us' put after 'artyads' is 'artyadsus'.
'artyadsus' is an anagram of 'SATURDAYS'.

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I've seen this clue in The Telegraph.

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