Indulge (6)
(Other definitions for pamper that I've seen before include "Spoil, cosset" , "Treat with over-indulgence" , "'Indulge, spoil (6)'" , "Treat luxuriously" , "Treat indulgently" .)
'indulge' is the definition.
(I know that humour is a type of indulge)
This is the entire clue.
(Other definitions for humour that I've seen before include "See 12" , "Wit" , "The quality of being funny" , "A sense of . . . . . . - the quality of enjoying amusing things" , "gags?" .)