what indicate "well" and "fixed" concerning "well-fixed"?

Question

according to the dictionary.
"well-fixed" means rich.
but what indicate "well" and "fixed" ?

Answer 1

You'll find those in your dictionary, too, hopefully. If not, you might want to get a better dictionary. I recommend the Harper Collins Beginner's ESL Dictionary.
"Fixed" in this sense, can mean that things are provided for the person.
Next time you're asking for a definition, use "mean" instead of "indicate".

Answer 2

We sometimes refer to rich people as being "well off."

In this sense, "fixed" means "set for life."