Oil
noun
The kanji and the word are exactly the same. That means they share meanings as well.
You need to apply oil to a bra (あぶら) because it's stuck on you. You can't get it unhooked, so you have to slide it off. Problem is, it's too tight, which is why a bra needs oil to slide off.
その割りには油は綺麗だね。
Comparatively, this oil is pretty pure.