When the first 5 characters of a command typed into the console or chat are CLEAR the remaining characters of the command are ignored and it is treated as just /clear (and clears all the text).

For example, the TargetLess plug-in has a /clearpin command that works fine if bound to a key, but if I try to type it into the console acts as if I typed just /clear.

I can get around it by creating an alias: /alias pinclear clearpin
Then type /pinclear in the console to have the desired effect.

Not a high priority or anything given the workaround.

Ah heh, interesting. oops. Yeah, that's an easy fix.