Primarily kale and peppers, suitable for stuffing (5)
I believe the answer is:
kapok
'stuffing' is the definition.
(I've seen this before)
'primarily kale and peppers suitable' is the wordplay.
'primarily' indicates taking the first letters.
'suitable' becomes 'ok'.
The initial letters of 'kale and peppers' is 'kap'.
'kap'+'ok'='KAPOK'
'for' is the link.
(Other definitions for kapok that I've seen before include "filler" , "Silk-cotton" , "Natural stuffing fibre" , "A plant fibre used for stuffing and insulation" , "Growth used for stuffing" .)