Kind, somewhat generous, or thoughtful (4)
I believe the answer is:
sort
'kind' is the definition.
(I know that kind can be written as sort)
'somewhat generous or thoughtful' is the wordplay.
'somewhat' indicates a hidden word.
'SORT' can be found hidden inside 'generous or thoughtful'.
(Other definitions for sort that I've seen before include "The kind to categorise" , "Type, category" , "fashion" , "Separate - kind" , "Group" .)