Top speaking part (4)

I believe the answer is:

peak

'top' is the definition.
('peak' can be a synonym of 'top')

'speaking part' is the wordplay.
'part' indicates the answer is hidden within the clue.
'PEAK' is hidden in the letters of 'speaking'.

(Other definitions for peak that I've seen before include "High point" , "Part of cap; mountain" , "Pinnacle" , "Acme" , "Tip" .)

I've seen this clue in The Telegraph.

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