What does the cryptic crossword clue "Ball carrier loses half of boot during rugby set piece (7)" mean?

The wordplay uses a container (one word inside another). OT (synonym="OT") in SCRUM (synonym="rugby set piece") = SCROTUM The answer is SCROTUM.

Ball carrier loses half of boot during rugby set piece (7)

Guardian Cryptic #29161 | 18 Down | 2023-08-29 flower