* Noun: This is the most common usage, referring to the act of clearing something, a space that has been cleared, or permission to proceed.
* Adjective: It can describe something that is cleared, such as "clearance sale" (items sold at a reduced price).
* Verb: While less common, "clearance" can be used as a verb, meaning to clear something or to give permission to proceed.
Examples:
* Noun: "The security clearance was denied."
* Adjective: "The store had a clearance sale on winter clothes."
* Verb: "The manager cleared the debris after the storm."
Without context, it's impossible to determine the specific part of speech.