A Writer's Question

Who am I?

If thrown out of window, it makes a wife grieve.
What's added to the front door helps sustain a life.

Ducks out of a row need a g to grow.

Fly removes why and becomes flea.

What happens to blooms in a  monsoon?

Have you solved the first riddle?

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Amuse then reuse. 
        Leave out a letter or make an exchange for the better.

It's the letter N.