The most common and most likely answer to this crossword clue is the 4 letter word MIKE
I've seen this crossword clue in Financial Times
M
I
K
E
More clues leading to the result MIKE
- Chap that helps speaker to be heard
- You’ll see me holding one, karaoke just starting?
- Speaker’s helper to be found before November
- Help for speaker that comes before November
- Pence perhaps beginning to madden former President
- Korean leader turned on English chap
- T Reid comes before November
- Michael's microphone
- Little Michael's // little microphone
Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MIKE mean?
MIKE noun- A microphone.
- To microphone; to place one or more microphones (mikes) on.
- To measure using a micrometer.
- A minute.