Wanted for a half done terrible deed (6)
I believe the answer is:
needed
'wanted' is the definition.
(needing is a kind of wanting)
'a half done terrible deed' is the wordplay.
'a half' means to take half the letters.
'terrible' indicates anagramming the letters.
'done' cut in half is 'ne'.
'deed' anagrammed gives 'eded'.
'ne'+'eded'='NEEDED'
'for' is the link.
(Other definitions for needed that I've seen before include "Required; sounds like worked (dough)" , "Obligatory" , "Essential; called for" , "'Wanted, required (6)'" , "Lacked something essential" .)