Each answer is made up of two words. The words are identical with the exception of one letter. All words are six letters.
Example: a famous castaway becomes a pointer or Ginger -> Finger
-1. A superhero turns into someone who collects money from illicit activities.
-2. an ancient "book" turns into a promenade
-3. sauce making step becomes an adder?
-4. a fall becomes a street fight
-5. a seed becomes an animal shelter
-6. a prop turns into a catch
-7. a group of posts becomes a danger
-8. brood becomes a skiers delight
-9. missing becomes approval
-10. an excited state of agitation turns to languish
Did you ever stop to think and then forget to start again?