The language of Somerset? (4)

I believe the answer is:

erse

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

'of somerset' is the wordplay.
'of' says the answer is hidden in the clue.
'ERSE' is hidden within 'somerset'.

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

I've seen this clue in The Telegraph and The Globe and Mail.

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