What does the cryptic crossword clue "Union-related joke about ‘turning tail’ (7)" mean?

The definition is "Union". The wordplay uses an anagram. NUP (synonym="NUP") + TIAL (synonym="TIAL") = NUPTIAL The answer is NUPTIAL.

Union-related joke about ‘turning tail’ (7)

Guardian Cryptic #29603 | 26 Across | 2025-01-28 flower