Old English clyccan "bring together, bend (the fingers), clench," from PIE *klukja- (cf. Swedish klyka "clamp, fork;" related to cling). Influenced in meaning by Middle English cloke "a claw." Related: Clutched; clutching.
"nest" in reference to chickens, eggs, 1721, from clekken "to hatch" (c.1400). Cf. batch/bake. Probably from a Scandinavian source (e.g. Old Norse klekja "to hatch"), perhaps of imitative origin (cf. cluck).
"claw, grip, grasp," c.1300, from cloche "claw," from cloke (c.1200), related to clucchen, clicchen (see clutch (v.)). Meaning "grasping hand" (1520s) led to that of "tight grasp" (1784). Related: Clutches.
mechanical part, 1814, from clutch (v.), with the "seizing" sense extended to "device for bringing working parts together." Originally of mill-works, first used of motor vehicles 1899. Meaning "moment when heroics are required" is attested from 1920s.