A highly regarded young footballer in PO4, Harry joins up with Boro on loan from Sky Bet Championship side Portsmouth until January 2026.
The 18-year-old made his senior debut for Pompey back in January, appearing as a substitute in an Emirates FA Cup Third Round Proper tie at Wycombe Wanderers.
Clout also featured on the bench for the Fratton Park outfit in Sky Bet Championship games against Luton Town, Middlesbrough and Bristol City last season.
Harry was a part of John Mousinho’s Pre-Season training camp out in Slovakia last month, but not after becoming the first Portsmouth Academy player to earn a senior deal in two years.
The versatile teenage winger or forward netted against Farnborough in the July Friendly at the Saunders Transport Community Stadium, and built up his experience in Pompey’s unbeaten Pre-Season with further games against Crawley Town, Reading, Havant & Waterlooville and Brighton & Hove Albion.