Colliery boss in a Somerset town (8)

I believe the answer is:

minehead

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'a somerset town' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'colliery boss' is the wordplay.
'colliery' becomes 'mine' (a colliery is a coal mine).
'boss' becomes 'head' (synonyms).
'mine'+'head'='MINEHEAD'

'in' acts as a link.

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