What does the cryptic crossword clue "Every so often, noble lines wise to say? (6)" mean?

The wordplay uses a container (one word inside another). EARL (synonym="noble") in YY (synonym="wise to say") = YEARLY The answer is YEARLY.

Every so often, noble lines wise to say? (6)

Guardian Cryptic #29146 | 5 Down | 2023-08-11 flower