Manage development of voiceprint without IP (8)
I believe the answer is:
contrive
'manage' is the definition.
(thesaurus)
'development of voiceprint without ip' is the wordplay.
'development of' is an anagram indicator (I've seen 'development' mean this).
'without' indicates named letters should be taken away.
'voiceprint' with 'ip' taken out is 'vocerint'.
'vocerint' anagrammed gives 'CONTRIVE'.
(Other definitions for contrive that I've seen before include "Devise with artifice" , "Plan cleverly, in covert way" , "Manage - scheme" , "Devise; manage" , "Improvise" .)