Clarke moves to the Staggies on a season-long loan.
Manager Malky Mackay said, “Harry is a player that I have tracked and watched for some time having seen a lot of youth football during my time with the Scottish FA.
"He is a player with talent and ability but more so he has a tremendous attitude and one that I think is a perfect fit for our club."
“I would also like to thank Arsenal FC for giving us this opportunity to further develop Harry, and the way in which the loan deal was conducted over the last few weeks."
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