Stop marks getting scrubbed from part of chair (6)
I believe the answer is:
arrest
'stop' is the definition.
(I know that stop can be written as arrest)
'marks getting scrubbed from part of chair' is the wordplay.
'marks' becomes 'M' (former German currency).
'getting scrubbed from' suggests deleting specific letters.
'part of chair' becomes 'armrest' (part of an arm chair).
'armrest' with 'm' taken away is 'ARREST'.
(Other definitions for arrest that I've seen before include "Seize and take into custody" , "Take into custody as police do" , "Stop - detain" , "Apprehend; detain" , "Run in" .)