Your speed can be measured in a number of ways:

Clocked: That could mean measurement by pacing or by VASCAR, or could be read in conjunction with "radar" to indicate that your speed was measured by radar.
Radar: The officer used a radar-based speed measurement device to measure your speed.
Estimated: The officer applies formal training in the estimation of your speed, in order to estimate your speed.

The reference to posted would presumably indicate that there is a posted speed limit.

Massachusetts does not have a point system, but if you are convicted of speeding that conviction will appear on your driving record.

You have not indicated any facts that would suggest that you were not speeding. If you want people to discuss possible defenses to your ticket, you should share facts that might support a defense. You should investigate whether the radar was properly maintained and tested.