In Setup Mode, you can set the name of the additional percussion instrument (say, faux snare drum) to anything you like, e.g. ‘Clar. 1 clicks’ or even just ‘Clarinet 1’. Maybe you wouldn’t want to see the explicit instrument change (the single-line staff is a giveaway), but there are tricks to hide that: e.g. in the properties panel (in Engrave Mode) you can set the custom text of the instrument change to a single space, or you might change it to ‘key clicks’. This won’t show in the staff label on the next system.