Fighting the German keeper (6)

I believe the answer is:

warder

'keeper' is the definition.
(thesaurus)

'fighting the german' is the wordplay.
'fighting' becomes 'war'.
'the german' becomes 'der' ('the' in German).
'war'+'der'='WARDER'

(Other definitions for warder that I've seen before include "keeper" , "Gaoler" , "Jailer" , "One is in charge of prisoners" , "Prison officer" .)

I've seen this clue in The Telegraph.

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