Yes, CIRCUMVENT is a Scrabble word!

Letter values in Scrabble US: C 3, I 1, R 1, C 3, U 1, M 3, V 4, E 1, N 1, T 1.

Is it a valid word?

CIRCUMVENT is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

surround so as to force to give up
beat through cleverness and wit
avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues)

Also: hem in, put off.