Fly with speaker somewhere in Devon (9)
I believe the answer is:
dartmouth
'somewhere in devon' is the definition.
The definition suggests a singular noun which matches the answer.
'fly with speaker' is the wordplay.
'fly with' becomes 'dart' (I can't explain this - if you can you should believe this answer much more).
'speaker' becomes 'mouth' (you speak with your mouth).
'dart'+'mouth'='DARTMOUTH'
Can you help me to learn more?
(Other definitions for dartmouth that I've seen before include "Location of Britannia Royal Naval College" , "port" , "Devon resort" , "Devon town" .)