Times Jumbo Cryptic 862

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Four to finish.
7dn. Scholars an old woman 's shown round part of City.(8) G?E?I?N?
8dn. Irish girl entering soon after midnight in New Hampshire(5) N?A?H
18dn. Like Dutch fellow climbing, showing obsessional enthusiasm(8) ?E?M?N?C
42dn. British politician's fashion enthralling old London area.(8)?R?M?T?N

[bibblebub]

7d grecians
8d niamh

18d germanic
42d brompton

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Many thanks Bibblebub I thought of germanic but can't see Dutch bit, manic is obsessional enthusiasm

[bibblebub]

fellow = Reg, climbing => ger

and defn 4 here http://dictionary.reference.com/browse/Dutch is "Archaic. German; Teutonic"

[baitress]

reg climbing.
the dutch are germanic in race

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Many thanks both