A report by Toby Driver in the National Monument Record (available through Coflein) describes Caer Lletty-Llwyd as, “a triangular hillfort”, although it’s described elsewhere as oval in plan.
Driver also alludes to the original entrance to the fort:
The position of the original gateway is uncertain, suggesting the open parts of the hillfort have been altered in the past through cultivation or improvement. The gate may have lain on the north side where an oblique track gives access to the monument today.