Crossword Genius

Huge mobile amplifier (9)

Ross

I believe the answer is:

megaphone

'amplifier' is the definition.
(I've seen this before)

'huge mobile' is the wordplay.
'huge' becomes 'mega' (mega can mean very large).
'mobile' becomes 'phone' (mobile is a type of phone).
'mega'+'phone'='MEGAPHONE'

(Other definitions for megaphone that I've seen before include "Cone-shaped device to intensify the human voice" , "hearing aid" , "Funnel-shaped voice amplifier" , "form of diplomacy?" , "One projects sound" .)

I've seen this clue in The Sun.
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