What does the cryptic crossword clue "Period yielding 10 addled brain? Of course! (13)" mean?

The definition is "Period yielding 10". The wordplay uses an anagram. anagram of BRAINOFCOURSE ("brain? Of course!") [anagram: "addled"] = CARBONIFEROUS; definition: "Period yielding 10" The answer is CARBONIFEROUS.

Period yielding 10 addled brain? Of course! (13)

Guardian Cryptic #27674 | 9 Down | 2018-11-23 flower

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