Cruciverbalist

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The Cruciverbalist

Explanations

Northern hemisphere? .............................IGLOO

(An igloo is usually half-sphere-shaped)

Phrase that could end a single life ..............IDO

(Saying 'I Do' at the wedding ceremony will end the 'single' life)

Fire insurance? ..................................TENURE

(As in insurance against being fired from one's job)

Small construction company .......................LEGO

(Legos: the toy construction blocks)

John, to Ringo ...................................LOO

(John and Loo: two nicknames for bathrooms)

Curly poker? .....................................MOE

(As in the Three Stooges with Curly often poking Moe)