The defender joined the Gunners last season from Wolves - and he penned pro terms this week.
Clarke told the club's website: “Since a young age, this is what I’ve dreamed of, from playing football at school and in Sunday league. It’s hopefully just the start, but a good step.
“The staff members and players have all been really welcoming. I think I’ve settled in quite quickly and have loads of games under my belt in a short amount of time. It was important to stay match fit last season and keep pushing through because I knew it was going to be tough, but I needed those games under my belt and it was good to perform well with the team.
“The support has been really good. Coming into a new club halfway through the season, everyone is quite set, but they’ve been really supportive and helping me. All the instructions the staff and players have given me has made me confident going out on the pitch in training and games.
“The amount of hours my whole family have spent taking me up and down the country to play, without them I don’t think I’d be where I am. It takes up a lot of their lives as well, not just my own, and the sacrifices they make have helped a lot.
“My goals are to perform consistently and hopefully push towards the under-21s after having a good start to the season. I want to enjoy my football and see where it takes me because it’s a big season for me.
“Seeing players like Bukayo and Emile, it’s really good because they’re at the highest level of the game now. It makes all of us hungry to push there because we know it’s possible.”