Worsening annoyance (11)
I believe the answer is:
aggravation
I believe this clue is a double definition.
'worsening' is the first definition.
(thesaurus)
'annoyance' is the second definition.
(aggravation is a kind of annoyance)
(Another definition for aggravation that I've seen is " Annoyance will result".)
I've seen this clue in The Globe and Mail and The Telegraph.
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