What does the cryptic crossword clue "Sword-bearer's second relative crossing road (8)" mean?

The wordplay uses a hidden word. MO (synonym="MO") + RD (synonym="RD") + AUNT (synonym="AUNT") = MORDAUNT The answer is MORDAUNT.

Sword-bearer's second relative crossing road (8)

Independent Cryptic #11470 | 13 Across | 2023-07-17 flower