Good afternoon, Aquarius.
If you get into hot water, you get into a "...a.e"; also if one shaves, one does this to one's face.
Fancy, like Routemaster - the bus is equipped with two ....s, so it is ....ed.
Staple, as you worked out, is an anagram of petals - it's also a Scottish version of stopple, which is a pipe stem.
Hoping this helps!