Sound art gets a total overhaul by a couple of iconoclasts (5)
I believe the answer is:
music
'sound art' is the definition.
'music' can be an answer for 'art' (music is a kind of art). I am unsure of the 'sound' bit.
'a total overhaul by a couple of iconoclasts' is the wordplay.
'a total' becomes 'sum' ('sum' can be a synonym of 'total').
'overhaul' shows that the letters should be reversed in order (I've seen 'overhauled' mean this).
'by' is a charade indicator (letters next to each other).
'a couple of iconoclasts' becomes 'ic' (I can't justify this - if you can you should believe this answer much more).
'sum' backwards is 'mus'.
'mus'+'ic'='MUSIC'
'gets' acts as a link.
Can you help me to learn more?
(Other definitions for music that I've seen before include "Harmonious sounds" , "Vocal or instrumental sounds" , "Melodious sounds" , "Melody, harmony" , "Pleasing sound" .)