It's said I omitted to reveal some dialect (5)

I believe the answer is:

idiom

'some dialect' is the definition.
(synonyms)

'it's said i omitted to reveal' is the wordplay.
'to reveal' says the answer is hidden in the clue.
'IDIOM' is hidden within 'ts said i omitted'.

(Other definitions for idiom that I've seen before include "Characteristic style of a period" , "Vocabulary characteristic of a specific group" , "Style of speaking characteristic of a specific group" , "Language used by people or group, vernacular" , "Dialect, vernacular" .)

I've seen this clue in the Sydney Morning Herald.

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