Man in charge at first speaking into this? (3)

I believe the answer is:

mic

'speaking into this?' is the definition.
(a microphone is spoken into)

'man in charge at first' is the wordplay.
'man' becomes 'm' ().
'at first' suggests taking the first letters.
The initial letters of 'in charge' is 'ic'.
'm'+'ic'='MIC'

I've seen this clue in The Times.

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