Lying plate on stone, roughly (9)
I believe the answer is:
dishonest
'lying' is the definition.
('dishonest' can be a synonym of 'lying')
'plate on stone roughly' is the wordplay.
'plate' becomes 'dish' (I've seen this before**).
'on' indicates putting letters inside.
'roughly' indicates anagramming the letters.
'stone' anagrammed gives 'onest'.
'dish' inserted into 'onest' is 'DISHONEST'.
(Other definitions for dishonest that I've seen before include "Corrupt" , "Not on the level" , "Crooked" , "shady" , "cheat" .)