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PawG-
No worries. Some movements do that more than others - with some, when you push the crown in to start screwing it down it disengages the manual winding function, but on a lot of watches (and it tends to be the cheaper movements) it continues to wind the mainspring as you screw it down. If it’s fully wound (you’ve just taken it off your wrist) you will likely experience that resistance and clicking.
Regal
It’s not a clutch as such, it’s notches in the barrel wall that the end of the mainspring lodges against - when the spring is fully wound the end drags along the barrel wall and snaps into the notches as it passes. Try letting the watch wind down for 24 hours (i.e. without wearing it) and see if it still does it when you unscrew and then screw the crown back down.