Holy Joe's pitch on shortened mound (8)
I believe the answer is:
tartuffe
'shortened mound' is the definition.
The definition suggests a singular noun which matches the answer.
'holy joe's pitch' is the wordplay.
I cannot really see how this works, but
'pitch' could be 'tar' (synonyms) and 'tar' is located in the answer.
This explanation may well be incorrect...
'on' is the link.
Can you help me to learn more?
(Other definitions for tartuffe that I've seen before include "Hypocrite created by Moliere" , "The French play" , "insincere Frenchman" , "Moliere's hypocrite" , "Play by Moliere" .)