Language required by each individual (5)
I believe the answer is:
hindi
'language' is the definition.
(Hindi is an example)
'required by each individual' is the wordplay.
'required by' says the answer is hidden in the clue (the answer is required to spell part of the clue).
'HINDI' can be found hidden inside 'each individual'.
(Other definitions for hindi that I've seen before include "Asian language" , "Indian language" , "One of India's official languages" , "Indic language" , "language many use" .)