Write a little bit (3)
I believe the answer is:
jot
I believe this is a triple definition!
'write' is the first definition.
(I know that jot is a more specific form of the action the write)
'a little' is the second definition.
(thesaurus)
'bit' is the third definition.
(both can mean a small amount)
(Other definitions for jot that I've seen before include "Small piece - note" , "Write hurriedly" , "Write a short note" , "Set down briefly" , "Write hastily - a very small amount" .)