A parliamentarian speaker (3)

I believe the answer is:

amp

'speaker' is the definition.
(amp is short for amplifier)

'a parliamentarian' is the wordplay.
'parliamentarian' becomes 'MP' (Member of Parliament).
'a'+'mp'='AMP'

(Other definitions for amp that I've seen before include "Certain amount of power" , "Device making sound louder" , "Unit of electricity, in short" , "Map of electrical unit" , "Physics unit" .)

I've seen this clue in the Sydney Morning Herald.

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