Tongue twice split by different angle (7)
I believe the answer is:
bengali
'tongue' is the definition.
(Bengali is an example)
'twice split by different angle' is the wordplay.
'twice' becomes 'bi' (eg biannual, biweekly).
'split by' means one lot of letters goes inside another (inserted letters split the word open).
'different' indicates an anagram (letters placed in a different order).
'angle' anagrammed gives 'engal'.
'bi' placed around 'engal' is 'BENGALI'.
(Other definitions for bengali that I've seen before include "From Dhaka or Kolkata, perhaps" , "Indic language" , "East Indian" , "Ethnic group and language of NE Indian subcontinent" , "Asian character" .)