Leak (4)
I believe the answer is:
drip
'leak' is the definition.
(I know that leak can be written as drip)
This is all the clue.
(Other definitions for drip that I've seen before include "Sissy" , "Weak and pathetic person" , "Leak from tap" , "Liquid falling in small golbules, or a dull person" , "Intravenous administration of solution" .)