Lenient, merciful (7)
I believe the answer is:
clement
I believe this clue is a double definition.
'lenient' is the first definition.
(similar in meaning)
'merciful' is the second definition.
(similar in meaning)
(Other definitions for clement that I've seen before include "gentle approach" , "Temperate" , "(Of weather) mild, lenient" , "opponent for Winston" , "Kindly (applied to weather)" .)