Superfluous revolutionary and German worker (9)
I believe the answer is:
redundant
'superfluous' is the definition.
('redundant' can be a synonym of 'superfluous')
'revolutionary and german worker' is the wordplay.
'revolutionary' becomes 'red'.
'and german' becomes 'und'.
'worker' becomes 'ant' (worker is a type of ant).
'red'+'und'+'ant'='REDUNDANT'
(Other definitions for redundant that I've seen before include "without useful purpose" , "out of a job" , "No longer useful" , "getting P45?" , "excessive?" .)