Topographic feature of Caerphilly (4)
I believe the answer is:
hill
'topographic feature' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'of caerphilly' is the wordplay.
'of' says the answer is hidden in the clue.
'HILL' is hidden within 'caerphilly'.
Can you help me to learn more?
(Other definitions for hill that I've seen before include "High point, but not a mountain" , "high ground" , "High mass of land" , "Gradient" , "Raised area of land" .)