Music critic consulted over Beethoven's Fifth (4)
I believe the answer is:
shaw
'music critic' is the definition.
(George Bernard Shaw)
'consulted over beethoven's fifth' is the wordplay.
'consulted' becomes 'saw'.
'over' means one lot of letters goes inside another.
'beethoven's fifth' becomes 'h' (I've seen this in other clues).
'saw' placed around 'h' is 'SHAW'.
(Other definitions for shaw that I've seen before include "Man and Superman playwright" , "G. B. ---; T. E. ---" , "Playwright; small wood" , "making an appearance in Craiglockhart?" , "Irish author" .)