Yes, UNCLEAN is a Scrabble word!

Letter values in Scrabble US: U 1, N 1, C 3, L 1, E 1, A 1, N 1.

Is it a valid word?

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

soiled or likely to soil with dirt or grime
having a physical or moral blemish so as to make impure according to dietary or ceremonial laws