Content with shaking fist, say? (7)
I believe the answer is:
satisfy
'content' is the definition.
(I know that content is a more specific form of satisfy)
'with shaking fist say?' is the wordplay.
'with' means one lot of letters goes inside another.
'shaking' is an anagram indicator.
'fist' anagrammed gives 'tisf'.
'tisf' going within 'say' is 'SATISFY'.
(Other definitions for satisfy that I've seen before include "Content" , "Meet (requirements)" , "To convince" , "Meet expectations" , "Meet, comply with" .)