Probable standing stone, marked as such on OS 1:25000 map. Description from Coflein:
“An earthfast boulder, 1.4m by 0.6m by 0.9m, set on the high point of a spur and now upon a community boundary, thought to be a standing stone.”
coflein.gov.uk/en/site/304784/details/CWM+HENWEN%2C+MONOLITH/