Yes, APPLIES is a Scrabble word!

Letter values in Scrabble US: A 1, P 3, P 3, L 1, I 1, E 1, S 1.

Is it a valid word?

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

put into service; make work or employ for a particular purpose or for its inherent or natural purpose
be pertinent or relevant or applicable
ask (for something)
apply to a surface
be applicable to; as to an analysis
give or convey physically
avail oneself to
ensure observance of laws and rules;
refer (a word or name) to a person or thing
apply oneself to

Also: go for, put on, lend oneself.