Crossword Genius

Most dig at disturbed person expressing opinions arrogantly (9)

Ross

I believe the answer is:

dogmatist

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'person expressing opinions arrogantly' is the definition.
I can't judge whether this definition defines the answer.

'most dig at disturbed' is the wordplay.
'disturbed' indicates anagramming the letters (the order of letters is disturbed).
'most'+'dig'+'at'='mostdigat'
'mostdigat' is an anagram of 'DOGMATIST'.

Can you help me to learn more?

(Other definitions for dogmatist that I've seen before include "opinionated type" , "bigot" , "stickler" .)

I've seen this clue in The Irish Independent.
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