Sign from Ensemble Modern (6)
I believe the answer is:
emblem
'sign' is the definition.
(emblem is a kind of sign)
'from ensemble modern' is the wordplay.
'from' indicates the answer is hidden within the clue.
'EMBLEM' can be found hidden inside 'ensemble modern'.
(Other definitions for emblem that I've seen before include "Typifying symbol" , "Mark" , "Symbol, device that represents something" , "Visible symbol of an abstract idea" , "Representative object" .)