Yes, HOLDOUTS is a Scrabble word!

Letter values in Scrabble US: H 4, O 1, L 1, D 2, O 1, U 1, T 1, S 1.

Is it a valid word?

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

a negotiator who hopes to gain concessions by refusing to come to terms
a refusal by a negotiator to come to terms in the hope of obtaining a better deal
the act of hiding playing cards in a gambling game so they are available for personal use later