noun, の adjective
At the present time you're providing a service, so you're actively working. 現役 means you have a certain role (such as school teacher or a high school student, etc.) and you're still active in that role, as opposed to being retired or having graduated.
This word is also often used to describe students who are taking or have passed a university entrance exam while they were still high school students.
This is a jukugo word, which usually means on'yomi readings from the kanji. You learned the readings for both of these, but 役 uses a less common reading, so here's a mnemonic to help you remember this:
You're actively working at the 駅 (えき) and you plan to remain active there forever! You sure do love that 駅, it's like you're inseparable.
Dad's an active professional wrestler.
The author of this manga is still a high school student.
I am thinking of going overseas for a year without enrolling in college straight out of high school.