Crossword puzzle clue "thing with a life of its own"

Thing with a life of its own?

Paddle your own ___ (do your own thing)

This animal presumably spends its entire life in a shell ... correction: just the first part of its life

Word that becomes its own synonym when its first letter is moved to the end

Word that's its own synonym when its first two letters are replaced with "w"

The shoe department in its flagship store has its own zip code

ATM charges, because of course you have to pay some of your own money to access some of your own money

Soul Asylum "One ___ thing to call my own"