Communist and German worker no longer needed (9)
I believe the answer is:
redundant
'no longer needed' is the definition.
(I've seen this before)
'communist and german worker' is the wordplay.
'communist' becomes 'red' (red can informally mean communist).
'and german' becomes 'und' ('and' in German).
'worker' becomes 'ant' (worker is a type of ant).
'red'+'und'+'ant'='REDUNDANT'
(Other definitions for redundant that I've seen before include "excessive?" , "No longer required, unnecessary" , "no longer wanted" , "No longer useful" , "unwanted" .)