Rock arranged around wide loudspeaker (7)
I believe the answer is:
tweeter
'loudspeaker' is the definition.
(I know that tweeter is a type of loudspeaker)
'rock arranged around wide' is the wordplay.
I cannot really understand how this works, but
'wide' could be 'w' (abbreviation e.g. in cricket) and 'w' is present in the answer.
'rock' could be 'teeter' (I've seen this in another clue) and 'teeter' is located in the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tweeter that I've seen before include "Chirpy type" , "one sending message?" , "Poster of short message - little bird?" , "part of speaker" , "Person sending a messages of fewer than 140 characters" .)