Spot former European currency (4)
I believe the answer is:
mark
This clue is a double definition.
'spot' is the first definition.
(I've seen this in other clues)
'former european currency' is the second definition.
(former German currency)
(Other definitions for mark that I've seen before include "Indicate" , "Spot - sign - currency" , "Spot - score - note - boy's name" , "Victim for swindle" , "Brand - old German currency" .)