Amenable Charlie one into benefit (6)
I believe the answer is:
docile
'amenable' is the definition.
(thesaurus)
'charlie one into benefit' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'one' becomes 'i' (Roman numeral).
'into' means one lot of letters goes inside another.
'benefit' becomes 'dole' (informal term for a state benefits).
'c'+'i'='ci'
'ci' put into 'dole' is 'DOCILE'.
(Other definitions for docile that I've seen before include "Gentle and biddable" , "Willing to be taught or led" , "Easily managed and trainable" , "asleep?" , "Willing to obey, not aggressive" .)