Mound close to church one’s going to (4)
I believe the answer is:
hill
'mound' is the definition.
(I know that mound can be written as hill)
'close to church one's going to' is the wordplay.
'close to' indicates one should take the final letters (the close of something is the end).
'one' becomes 'i' (Roman numeral).
'going to' becomes 'll' (as in he'll, we'll etc).
The last letter of 'church' is 'h'.
'h'+'i'+'ll'='HILL'
(Other definitions for hill that I've seen before include "Any one of three F1 driving champions" , "Rise" , "See 14" , "Canvasser of opinions" , "Gradient" .)