Yes, WICKET is a Scrabble word!

Letter values in Scrabble US: W 4, I 1, C 3, K 5, E 1, T 1.

Is it a valid word?

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

cricket equipment consisting of a set of three stumps topped by crosspieces; used in playing cricket
a small arch used as croquet equipment
small gate or door (especially one that is part of a larger door)
small opening (like a window in a door) through which business can be transacted

Also: wicket door, wicket gate.