Dab dry (4)
I believe the answer is:
blot
'dab dry' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for blot that I've seen before include "Stain left by spilled ink" , "Spot of ink, paint etc" , "Cross out; inky mess" , "Ink stain; disgrace" , "Dark mark or stain" .)