Although it's a famous mystery who Carly Simon was crooning about in "You're So Vain," the singer has given us an answer, at least for 2016, by agreeing to place her iconic song in an anti-Trump ad.

The new spot, created by the pro-Hillary Clinton Super Pac Patriotic Artists and Creatives, is an unabashed, almost joyous attack on the Republican candidate. It opens with a mosaic of TV screens featuring soundbites of various talking heads, including prominent members of the Republican party, calling Mr. Trump a narcissist.

Ms. Simon's song then kicks in and the ad goes on to employ a now familiar anti-Trump advertising device: turning the candidate's own words against himself by recycling moments such as when he mocked a disabled New York Times reporter or an E! interview in which he admitted he couldn't say that he treated women with respect. It also piles on image after image of Trump-branded products, from steaks to casinos to buildings and water bottles.

According to the ad's YouTube post, this is the first time that Ms. Simon has agreed to use her song in a political ad. (It appeared in advertising at least once before in a U.K. ad for Dunlop tires.) But as revealed in a Forbes piece by Melinda Newman, there's a notable bit of new material: a freshly recorded line from Ms. Simon herself, in which she replaces the lyric "your scarf, it was apricot" to "your face, it was apricot" just as the spot projects a close-up shot of Mr. Trump's neon orange puckering mug.