What does the cryptic crossword clue "Lad musing about member of association (9)" mean?

The wordplay uses an anagram. anagram of LAD (synonym="… about") + MUSING (synonym="MUSING") = GUILDSMAN The answer is GUILDSMAN.

Lad musing about member of association (9)

Guardian Cryptic #29611 | 16 Down | 2025-02-06 flower