Sound system blasting trees round (6)
I believe the answer is:
stereo
'sound system' is the definition.
(stereo is a kind of sound system)
'blasting trees round' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'trees' is 'stere' which is present in the answer.
'round' could be 'o' (round can mean a round object) and 'o' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stereo that I've seen before include "Musical sound with two speakers" , "Music player with two speakers" , "System that gives a three-dimensional sound" , "With twin audio channels" , "Means of amplification of sound through two or more channels" .)