Cheat in Patrick’s terminology (9)
I believe the answer is:
trickster
'cheat' is the definition.
(I know that cheat can be written as trickster)
'in patrick's terminology' is the wordplay.
'in' says the answer is hidden in the clue.
'TRICKSTER' can be found hidden inside 'patricks terminology'.
(Other definitions for trickster that I've seen before include "Conman" , "Loki, say" , "Hoaxer" , "Practical joker" , "Cheat, deceiver" .)