Very loud, boring, ignorant drunk causing offence (10)

I believe the answer is:

affronting

'causing offence' is the definition.
(to affront someone is to offend them)

'very loud boring ignorant drunk' is the wordplay.
'very loud' becomes 'ff' (musical abbreviation).
'boring' means one lot of letters goes inside another (some letters must 'bore' a hole into other letters).
'drunk' indicates an anagram.
'ignorant' anagrammed gives 'aronting'.
'ff' inserted inside 'aronting' is 'AFFRONTING'.

(Another definition for affronting that I've seen is " vexing".)

I've seen this clue in The Independent.

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