Thought; kindness (13)
I believe the answer is:
consideration
I believe this clue is a double definition.
'thought' is the first definition.
(consideration is a kind of thought)
'kindness' is the second definition.
(I know that consideration is a type of kindness)
(Other definitions for consideration that I've seen before include "A motive" , "Thoughtfulness - relevant factor" , "Study" , "factor to be borne in mind" , "Reward; careful thought" .)