not explicitly covered, but the params:hide(parameter_id) and _menu.rebuild_params() functions from params | monome/docs apply to system parameters as well 
clock params are rebuilt with each script launch clear (which happens with every script launch), so a script could manipulate their state + visibility without worrying about these changes persisting past its life. you can get the parameter_id by toggling on mapping mode (K1 + K3 on any params page), then include something like this in your script’s init:
params:set("clock_crow_out",1) -- sets 'crow out' to 'off'
params:hide("clock_crow_out") -- hide the 'crow out' param
params:hide("clock_crow_out_div") -- hide the 'crow out div' param
params:hide("clock_crow_in_div") -- hide the 'crow in div' param
_menu.rebuild_params() -- applies those ':hide' changes
hope this helps!
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