Terse about circle having two speakers (6)
I believe the answer is:
stereo
'having two speakers' is the definition.
'terse about circle' is the wordplay.
'about' indicates an anagram.
'circle' becomes 'O' (O is a circle).
'terse' with letters rearranged gives 'stere'.
'stere'+'o'='STEREO'
(Other definitions for stereo that I've seen before include "Music player with two speakers" , "Sound - not mono" , "Sound transmission from two sources through two channels" , "Tape recorder" , "System of sound reproduction" .)