Persistent cheat with stoneworker (8)
I believe the answer is:
constant
'persistent' is the definition.
(thesaurus)
'cheat with stoneworker' is the wordplay.
I cannot really see how this works, but
'cheat' could be 'con' (con is a kind of cheat) and 'con' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for constant that I've seen before include "Steadfast or unvarying" , "Recurring and unchanging" , "Perpetual" , "exactly as before" , "Loyal - firm" .)