The highly-rated 18-year-old striker has extended his stay at The Hawthorns until 2024 after an impressive goalscoring campaign in the youth set-up last term.
Cleary, who only turned 18 in April, is one of the star products of the current Baggies academy and according to reports has been in-demand both domestically and abroad this summer.
But Cleary, whose scholarship deal ran until December this year, has penned professional terms as he continues his eye-catching progression.
After uncertainty surrounding his future, the talented frontman has committed himself to the club where he has made significant steps in his development.
The teenager netted 35 goals last season during involvement with various youth sides, scoring at a regular rate for the club's under-18s and likewise with the under-23s, who went on claim the PL2 Cup over Wolves.
Cleary will next eye a push into first-team boss Steve Bruce's senior thoughts, now the club have wrapped up his immediate future for the next couple of seasons.