Crossword Genius

In time, what’s taken to get one open-mouthed? (10)

Ross

I believe the answer is:

temporally

'in time' is the definition.
(temporal means relating to time)

'what's taken to get one open-mouthed?' is the wordplay.
'what's taken' becomes 'temp' (temperature - you can get your temperature taken).
'to get' is a charade indicator (letters next to each other).
'one open-mouthed?' becomes 'orally' (oral means relating to the mouth).
'temp'+'orally'='TEMPORALLY'

I've seen this clue in The Times.
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