What does the cryptic crossword clue "So a son, true to form, is disloyal (10)" mean?

The definition is "disloyal". The wordplay uses an anagram. anagram of SO + A + SON, + TRUE = TREASONOUS; definition: "disloyal" The answer is Treasonous.

So a son, true to form, is disloyal (10)

Telegraph Prize Cryptic #3009 | 20 Across | 2019-06-23 flower

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