Clue: Is almost all poetry garbled like Dracula or The Secret Diary of Adrian Mole, aged 13 3/4? (10)
Answer: EPISTOLARY
Explanation: Definition: like Dracula or The Secret Diary of Adrian Mole, aged 13 3/4
Anagram of IS AL[L] POETRY – I was going to complain that *Adrian Mole* isn't an epistolary novel (though *Dracula* is), but at least according to some sources the term can more apply more generally a novel told in various kinds of documents, e.g. a diary