Yes, CLIPPERS is a Scrabble word!

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

Is it a valid word?

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

(electronics) a nonlinear electronic circuit whose output is limited in amplitude; used to limit the instantaneous amplitude of a waveform (to clip off the peaks of a waveform)
a fast sailing ship used in former times
shears for cutting grass or shrubbery (often used in the plural)
scissors for cutting hair or finger nails (often used in the plural)

Also: clipper ship.