Fair Day Cathouse: Easy IV

[Jon]

An unwilling plumber's trademark.

I weigh the same whether I am full or not.

Few have seen my dark side.

If I look different, don't worry; it's just a phase I am going through.

A place for an eagle to land.

Men in suits leave quite an impression on me.

[Maturins_Daughter]

I believe I have it, but don't want to ruin it for others who might want a crack at it ;)

M-o-o-n! that spells Moon!

[Jean]

since Bonnie spoiler-tagged something, I will do the same

Moon

or is it too obvious an answer? there must be some hidden trick?

[Jon]

All spoilers are correct thus far.

(You will notice, Bear friend, the title to this series is "EASY")

[Jean]

D'oh!