What does the cryptic crossword clue "Dialect is described in old manuscript originally (5)" mean?

The definition is "Dialect". The wordplay uses a charade (building blocks). I (first_letter="is") + D (first_letter="described") + I (first_letter="in") + O (abbreviation="old") + M (first_letter="manuscript") = IDIOM; definition: "Dialect" The answer is IDIOM.

Dialect is described in old manuscript originally (5)

Daily Mail Cryptic #16521 | 21 Down | 2021-02-26 flower

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