Former German currency (4)
I believe the answer is:
mark
'former german currency' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for mark that I've seen before include "[BOOK] of the 26 [BIBLE]" , "Note - evangelist" , "Indicate" , "Matthew, . . . ., Luke and John" , "Indication - notice" .)