The answer to these clues is two words that are one letter different from one another. All answers are six letters.
Example: fringe / more adventurous = border / bolder
-1. bug / alloy containing tin
-2. move about restlessly / thingamajig
-3. peace / overthrow
-4. gloomy / anxiety
-5. car part / let down
-6. excite / game bird
-7. provoke / chisel
-8. rue / hidden
-9. breakfast food / puzzle
-10. realm / pass
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Did you ever stop to think and then forget to start again?