Hole behind me perfect for amplifier (9)

I believe the answer is:

megaphone

I'm a little stuck... Click here to teach me more about this clue!

'amplifier' is the definition.
(thesaurus)

'hole behind me perfect' is the wordplay.
'hole' becomes 'gap' (I can't explain this - if you can you should give a lot more credence to this answer).
'behind' says to put letters next to each other.
'perfect' becomes 'hone' ('hone' can be a synonym of 'perfect').
'gap' put after 'me' is 'megap'.
'megap'+'hone'='MEGAPHONE'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for megaphone that I've seen before include "Loudspeaker" , "Voice-amplifying device" , "Loudhailer" , "Cone-shaped device to intensify the human voice" , "Funnel-shaped voice amplifier" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.