Speak a little for a tenner (5)
I believe the answer is:
orate
'speak' is the definition.
(orating is a kind of speaking)
'a little for a tenner' is the wordplay.
'a little' indicates the answer is hidden within the clue.
'ORATE' is hidden in the letters of 'for a tenner'.
(Other definitions for orate that I've seen before include "Make a formal speech" , "Make a flowery speech" , "Deliver a speech" , "Lecture" , "Make a lengthy speech" .)