Language used by writers elsewhere (4)
I believe the answer is:
erse
'language' is the definition.
(Erse is an example)
'used by writers elsewhere' is the wordplay.
'used by' indicates a hidden word.
'ERSE' is hidden within 'writers elsewhere'.
(Other definitions for erse that I've seen before include "Kind of Gaelic for seer" , "Irish Gaelic language" , "Possibly the language" , "Old Gaelic for the seer" , "Old language spoken by strange seer" .)