21-year-old Burton returns to Aggborough on a contract until the end of the season, after spending time on loan with the club earlier this season.
"Steve did well in his first stint here and I'm pleased to have him back here with us," said Harriers boss Jan Molby (pictured).
Brown arrives on loan from West Bromwich Albion for the next month.
The 20-year-old is yet to make a first team appearance at The Hawthorns, but much is expected of him.
Clarke, another young striker, comes in from neighbours Wolverhampton Wanderers - to bolster Molby's options further.
"It will do Leon the power of good to get some League experience under his belt. There is nothing better than playing first team football," said Wolves boss Dave Jones.
Meanwhile, Kidderminster midfielder Robert Betts has joined Conference outfit Hereford United on loan.
