I have a Nissan 87 720 short bed and the clutch is loose on 1990 Nissan Pickup (D21)

do I replace clutch or is it fluid any advice is greatly appreciated

Asked by for the 1990 Nissan Pickup (D21)
Pedal loose or vehicle speed not increasing as before , with engine speed? Usually refered to as 'slipping'.
2 answers
Explain loose, bolts to flywheel?