My winch was not original equipment apparently, and it does not have a clutch, just a capstan. If there is a clutch, there would have to be a lever or another wire for it.
In florida, letting the winch wind out with the motor is ok, since one is usually anchoring in shallow water. In deep water, the clutch would certainly speed things up.
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida