Compère presenting piece from Shostakovich (4)
I believe the answer is:
host
'compere' is the definition.
(I've seen this before)
'piece from shostakovich' is the wordplay.
'piece' indicates the answer is hidden within the clue.
'HOST' is hidden within 'from shostakovich'.
'presenting' acts as a link.
(Other definitions for host that I've seen before include "One entertaining, large number" , "One entertains guests" , "Multitude - emcee" , "TV presenter; large number" , "Provide entertainment" .)