What does the cryptic crossword clue "Left half or right half in team, with predictable result (3-5)" mean?

The wordplay uses a charade (building blocks). ONE (synonym="ONE") + HORSE (synonym="HORSE") = ONEHORSE The answer is ONEHORSE.

Left half or right half in team, with predictable result (3-5)

Guardian Cryptic #29292 | 14 Across | 2024-01-30 flower