Yes, FIXINGS is a Scrabble word!

Letter values in Scrabble US: F 4, I 1, X 8, I 1, N 1, G 2, S 1.

Is it a valid word?

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

food that is a component of a mixture in cooking
the accessories that normally accompany (something or some activity)
the act of putting something in working order again
restraint that attaches to something or holds something in place
the sterilization of an animal
(histology) the preservation and hardening of a tissue sample to retain as nearly as possible the same relations they had in the living body

restore by replacing a part or putting together what is torn or broken
cause to be firmly attached
decide upon or fix definitely
prepare for eating by applying heat
take vengeance on or get even
set or place definitely
kill, preserve, and harden (tissue) in order to prepare for microscopic study
make fixed, stable or stationary
make infertile
influence an event or its outcome by illegal means
put (something somewhere) firmly
make ready or suitable or equip in advance for a particular purpose or for some use, event, etc

Also: furbish up, touch on, pay back, pay off, set up, gear up.

Not playable in Scrabble US: DESEXUALISE.