The youth, who cannot be identified, was formally arraigned for murder at the Belize Family Court after he was arrested on Monday. Police said he is well known to them.
Clarke, 27, who worked for the Amandala newspaper, was killed by the gunman who fired several shots at him as he headed home early in the morning on July 6.
Police said the 27-year-old man received gunshot wounds to his abdomen and chest and was taken to the hospital where he was pronounced dead on arrival.
Clarke’s mother, Julia Clarke said her son had now become a victim of the very gun violence he reported on frequently.