Taylor Swift loves a good puzzle, as she teases fans with a clue as to what she's about to reveal.

The singer posted a photo on Instagram with "5" and "Woods" with a picture of a forest, sparking fans to speculate that she will unveil the already-discussed track 'Out of the Woods'(which is allegedlyabout Harry Styles), in five days time.

5 days. #1989

Keen to make it clear this track will 'not' be her next single, Swift tweeted: "To clarify, what is coming in the next few days is a new song that I think best represents #1989. It is NOT my next single. #ShakeItOff"

According to the Rolling Stone interview from Swift as she discussed her new album, 1989, "Out of the Woods" tells a "frantic tale of a relationship" that Taylor described as a struggle.

"Forget making plans for life – we were just trying to make it to next week," she said.

The track also references a snowmobile accident with one of her exes, who is assumed to be Styles, when they both ended up in A&E.

"Remember when you hit the brakes too soon/ Twenty stitches in a hospital room," Swift sings.

The song is co-written by Fun's Jack Antonoff, who has already told fans on Twitter it is "one of the most important things I've ever been a part of."

To further speculation, fans who were lucky enough to attend the Taylor Swift 1989 listening party can't stop tweeting about 'OotW'.

1989 is set for release in the UK October 27.