This read-write enumeration (nil or clear) is a command object that, when set to clear(2), resets all statistics counters in the RX port's stats group, but per the description only takes effect if hcxStatsControl is set to wrapCurr. An admin uses it to zero out accumulated cell and error counts after resolving a known problem so future readings reflect only post-fix conditions. For example, after replacing a faulty connector that was causing FEC errors, the admin sets hcxPortClearStats to clear(2) so the next report starts from a clean baseline.