Language in another sentence (4)

I believe the answer is:

erse

'language' is the definition.
(historical term for Scottish Gaelic)

'in another sentence' is the wordplay.
'in' indicates a hidden word.
'ERSE' can be found hidden inside 'another sentence'.

(Other definitions for erse that I've seen before include "Old Gaelic for the seer" , "Old Celtic language" , "Old name for Celtic languages" , "Name sometimes given to languages of the Celts in Ireland and Scotland" , "Old language spoken by strange seer" .)

I've seen this clue in The Mirror.

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