Memo stamp (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
urgent
'memo stamp' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for urgent that I've seen before include "High priority" , "Requiring speedy action" , "Needing immediate action" , "demanding speedy action" , "Of immediate importance" .)