Notice plug (13)

I believe the answer is:

I believe this is a double definition.

'notice' is the first definition.
(I've seen this before)

'plug' is the second definition.
(thesaurus)

(Other definitions for advertisement that I've seen before include "Public promotion" , "Placard" , "Bill" , "Publicity announcement" , "trailer" .)

I've seen this clue in The Times.

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