Horse down under Midlands city in reserve (6)

direction: down
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Source: Mephisto 3083 https://times-xwd-times.livejournal.com/2218482.html

See replies for a hint, the answer, and an explanation

#puzzles #crosswords #CrosswordPuzzles #CrypticCrosswords #CrypticCrosswordPuzzles

B_U_B_

[this post gives you every second letter of the answer to help you solve the clue]