Manipulate requirement that’s voiced (5)
I believe the answer is:
knead
'manipulate' is the definition.
(kneading is a kind of manipulating)
'requirement that's voiced' is the wordplay.
'requirement' becomes 'need' (synonyms).
'that's voiced' shows a homophone (sound like).
'need' is a homophone of 'KNEAD'.
(Other definitions for knead that I've seen before include "Work together" , "Work dough or massage flesh" , "Work with finger movements" , "Pummel dough" , "Work (dough) into mass" .)