/usr/share/irssi/help/clear is in irssi 0.8.15-5ubuntu3.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | CLEAR %|[-all] [<refnum>]
This command clears the current window of all text. It is useful for wiping a screen that has rendered improperly (such as due to a bad termcap entry) or that contains sensitive information (such as one's OPER password).
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