Language in longer sentence (4)

I believe the answer is:

erse

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

'in longer sentence' is the wordplay.
'in' says the answer is hidden in the clue.
'ERSE' can be found hidden inside 'longer sentence'.

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

I've seen this clue in The Mirror.

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