Improvise, speak without notes (2-3)
I believe the answer is:
ad-lib
I believe this is a double definition.
'improvise' is the first definition.
(I know that improvise can be written as ad-lib)
'speak without notes' is the second definition.
(I've seen this in another clue)
(Other definitions for ad-lib that I've seen before include "Extemporise" , "Unprepared remark" , "spontaneous comment" , "Improvise" , "Speak off the cuff" .)