FOUR BECOME FIVE
Two clues are given. The first answer has 4 letters. The second answer can be identified by adding one letter to the FRONT of the first answer, ie ooze & booze.
1. One pound / Sea creature
 Quid / Squid
2. Part of a foot / Tree of the conifer family
 Arch / Larch
3. Lazy / To walk in a furtive manner, especially sideways or obliquely.
 Idle / Sidle
4. Guitar player David Evans / Grass-like plant found typically in wet areas
 Edge / Sedge (David Evans is the lead guitarist with U2, known a The Edge)
5. A unit of measurement / Actor who posthumously won an Oscar for his role in Network
 Inch / (Peter) Finch
6. Female relative / Haggard
 Aunt / Gaunt
7. Part of a fisherman's equipment / Fish basket
 Reel / Creel
8. To engrave with acid / Sailing vessel with 2 masts
 Etch / Ketch
9. Iron oxide / The outer layer of a rocky planet
 Rust / Crust
10. An electronic functional building block in digital logic such as "and", "or", or "not"/ Semiprecious stone
 Gate / Agate