Mystical scientist sending river into European country marsh (10)

I believe the answer is:

swedenborg

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'mystical scientist sending' is the definition.
The definition suggests a singular noun which matches the answer.

'river into european country marsh' is the wordplay.
'river' becomes 'r' (abbreviation for river).
'into' indicates putting letters inside.
'european country' becomes 'sweden' (country in Europe).
'marsh' becomes 'bog' (a bog is a marshy area).
'sweden'+'bog'='swedenbog'
'r' inserted within 'swedenbog' is 'SWEDENBORG'.

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