The answers to the clues below will have something in common.

1. Toy warrior

2. Locomotive

3. Fast driver's characteristic

4. Quick (but not lasting) solution

5. Common household water conduit

6. The bar - at its highest

7. Popular frame house exterior wall covering 

8. Birthday party decorations, often

9. The UBA in SCUBA

10. Environmental impact metaphor

Answers:

 

1. TIN SOLDIER

2. IRON HORSE

3. LEAD FOOT

4. SILVER BULLET

5. COPPER PIPE

6. GOLD STANDARD 

7. ALUMINUM SIDING

8. HELIUM BALLOONS

9. OXYGEN TANK

10. CARBON FOOTPRINT