Watched blossom with introduction of Taylor Swift perhaps (8)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Sat(=watched?) + iris(=blossom) + T[aylor]. I'm struggling to match sat with watched – the only context I can think of is baby-sitting. The def refers to Jonathan Swift, author of the satirical work Gulliver's Travels.