It's spoken in suburban Tunbridge Wells (5)
I believe the answer is:
'it's spoken' is the definition.
I can't tell whether this definition defines the answer.
'in suburban tunbridge wells' is the wordplay.
'in' indicates a hidden word.
'BANTU' can be found hidden inside 'suburban tunbridge wells'.
Can you help me to learn more?
(Other definitions for bantu that I've seen before include "African tongue" , "Family of southern African languages" , "Group of languages including Swahili and Xhosa" , "Type of language" , "Group of Niger-Congo languages" .)