Coarse speech succeeded with Metropolis director (5)
I believe the answer is:
slang
'coarse speech' is the definition.
(slang is coarse or improper speech)
'succeeded with metropolis director' is the wordplay.
'succeeded' becomes 's' (genealogical abbreviation).
'with' is a charade indicator (letters next to each other).
'metropolis director' becomes 'Lang' (Fritz Lang, director of the 1927 film Metropolis).
's'+'lang'='SLANG'
(Other definitions for slang that I've seen before include "Non-standard vocabulary" , "Vulgar parlance" , "Vulgar language" , "manner of speaking" , "Berate" .)