Censor second person using French language (5)
I believe the answer is:
bantu
'language' is the definition.
(Bantu is a group of African languages)
'censor second person using french' is the wordplay.
'censor' becomes 'ban' ('ban' can be a synonym of 'censor').
'second person using french' becomes 'tu' ('tu' is the second person pronoun 'you' in French).
'ban'+'tu'='BANTU'
(Other definitions for bantu that I've seen before include "Language group including Swahili, Xhosa and Zulu" , "Niger-Congo language" , "10 across language" , "Some Africans" , "African tongue" .)