Crossword Genius

Keep talking as doctor begins opening gas (5,2)

Ross

I believe the answer is:

drone on

'keep talking' is the definition.

'doctor begins opening gas' is the wordplay.
'doctor' becomes 'dr' ('Dr' can be a synonym of 'doctor').
'begins' suggests taking the first letters.
'gas' becomes 'neon' (I've seen this before).
The first letter of 'opening' is 'o'.
'dr'+'o'+'neon'='DRONE ON'

'as' is the link.

I've seen this clue in The Guardian.
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