Put on stone and mellowed (6)
I believe the answer is:
staged
'put on' is the definition.
(both can mean fake or affected)
'stone and mellowed' is the wordplay.
'stone' becomes 'st'.
'and' is a charade indicator (letters next to each other).
'mellowed' becomes 'aged' (I've seen this in another clue).
'st'+'aged'='STAGED'
(Other definitions for staged that I've seen before include "Organised (a performance)" , "Of a play, brought about" , "Put on (as show)" , "(Of play/opera) mounted" , "Presented a play" .)