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Help please! Why?
1. Not still uncomfortable indoors Ans Draughty
2. Unusual shape for half a pound of metal Ans Heptagon
3. It lengthened the tongue Ans Italian
4. Terrify with a very powerful punch Ans Affright

if there is a draught, the air will not be still - uncomfortable in doors is the definition part of the clue

a ff right

If you extend it to Italian you arrive at a tongue!

"It" is used to stand for "Italian" (or "Italy"), particularly in crosswords.

Half a pound is fifty p which has the shape of a heptagon.