Crossword Genius

New job in the O2? Couldn't say (4,3,2)

Ross

I believe the answer is:

dont ask me

'couldn't say' is the definition.

'new job in the o2?' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'job' becomes 'task' (synonyms).
'in' means one lot of letters goes inside another.
'the o2?' becomes 'dome'.
'n'+'task'='ntask'
'ntask' inserted within 'dome' is 'DONT ASK ME'.

I've seen this clue in The Guardian.
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