At the very beginning of Avengers: Endgame, it looked like Hawkeye was wearing a leg tag, the sort you wear if you've been released from prison for home imprisonment.
Was Hawkeye in trouble or did I miss-see something?
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He has this from taking a plea deal at the end of Captain America: Civil War alongside Ant-Man for siding with Cap and breaking the Sokovia Accords.
Bruce Banner: We need all hands on deck. Where's Clint?
Natasha Romanoff: After the whole Accords situation, he and Scott took a deal. It was too tough on their families, they're on house arrest.
Avengers: Infinity War
Woo goes into detail about why this happened in Ant-Man and the Wasp when talking to Cassie... and he is really good at that.
Cassie: Why can't you just leave my daddy alone?
Woo: Oh, Cassie. This must all seem like a bunch of confusing grown-up stuff to you, huh? Well, think of it this way: Your school has rules, right? Like...You can't draw on the walls. Well, your Daddy went to Germany and drew on the walls with Captain America. And that was a violation of Article 16, Paragraph 3 of the Sokovia Accords. Now as a part of his joint plea deal with Homeland Security and the German government, he's allowed to return to the U.S., provided he serve two years under house arrest, followed by three years of probation. and avoid any unauthorized activities, technology, or contact with any former associates, who were or currently are, in violation of said Accords, or any related statutes. Okay sweetie?
Ant-Man and the Wasp
And to be super clear here is Clint’s ankle monitor we see at the start of Endgame compared to Scott's we see in Ant-Man and the Wasp.
Yes, both Scott Lang and Clint Barton are wearing ankle monitors as a result of getting caught in the airport brawl during Avengers: Civil War.
Due to the violation of the Sokovia Accords, several Avengers were arrested and imprisoned inside the Raft. Clint Barton and Scott Lang decided to cut a deal with a government so they could return to their families. The authorities equipped both of them with monitors and appointed the FBI to keep track of them.