No rule for this one
No ending or word group predicts the article of Crew. Learn it as a pair and say it out loud: die Crew.
die Crew
It's die Crew. Crew is feminine, plural die Crews.
Die Crew ist freundlich.
The crew is friendly.
No ending or word group predicts the article of Crew. Learn it as a pair and say it out loud: die Crew.