Wag from Bootle regularly entertaining small Liverpudlian chanteuse (9)
I believe the answer is:
oscillate
'wag' is the definition.
(thesaurus)
'bootle regularly entertaining small liverpudlian chanteuse' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'entertaining' indicates putting letters inside (inviting in, as for dinner).
'small liverpudlian chanteuse' becomes 'scilla' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The alternating letters of 'bootle' are 'ote'.
'ote' placed around 'scilla' is 'OSCILLATE'.
'from' acts as a link.
Can you help me to learn more?
(Other definitions for oscillate that I've seen before include "Rock" , "shake" , "change sides" , "Swing like a pendulum" , "seesaw" .)