Erasmus iconically bestrides this art form (5)
I believe the answer is:
music
'this art form' is the definition.
(I know that music is a arts form)
'erasmus iconically bestrides' is the wordplay.
'MUSIC' is hidden within the letters.
However, I'm uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for music that I've seen before include "Composed sound" , "(Pleasant) sequence of sounds" , "Audible art form ..." , "Melodious sounds" , "'''If ... be the food of love, play on'' (Twelfth Night) (5)'" .)