Head bagging new job, I haven't been informed (4,3,2)

I believe the answer is:

dont ask me

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'i haven't been informed' is the definition.
I know nothing about this answer so I can't tell whether this works.

'head bagging new job' is the wordplay.
'head' becomes 'dome' (I've seen this before).
'bagging' indicates putting letters inside (I've seen this in other clues).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'job' becomes 'task' (synonyms).
'n'+'task'='ntask'
'dome' enclosing 'ntask' is 'DONT ASK ME'.

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I've seen this clue in The Guardian.

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