Charlie can flipping wait, wanting answer (6)
I believe the answer is:
nitwit
'charlie' is the definition.
(I know that charlie can be written as nitwit)
'can flipping wait wanting answer' is the wordplay.
'can' becomes 'tin' (both are metal containers).
'flipping' says the letters should be written backwards.
'wanting' is a deletion indicator (to want something can mean to lack it or need it).
'answer' becomes 'a' (abbreviation eg in Q and A).
'tin' back-to-front is 'nit'.
'wait' with 'a' taken away is 'wit'.
'nit'+'wit'='NITWIT'
(Other definitions for nitwit that I've seen before include "Informally, a foolish person, featherbrain" , "Foolish person like funny louse?" , "dope" , "Plonker" , "Blockhead" .)