Clayton is delighted to have sufficiently impressed manager Simon Grayson during his loan, and is now looking to progress further.
"Leeds is a massive club - just as big as Manchester City. It's definitely a place and an environment where I can learn and get better as a player," he told the club's official website.
"Everything at Leeds is geared up for the Premier League, the stadium, the facilities, the tremendous atmosphere, the fans, so I think it is definitely somewhere that I can grow and develop as a player.
"When you come on a month's loan you can feel as though you have to move the earth sometimes to impress and having got on only a couple of times it was in training where I was going to have to do that.
"It looks like I did that and, hopefully, I will be deserving of the contract. I was delighted to get the deal done and now I can't wait to get my career with Leeds started.
"If we keep fighting for every point, keep on scrapping, I think we can be there or thereabouts this season."