King with honour producing garment (4)
I believe the answer is:
robe
'garment' is the definition.
(I've seen this before)
'king with honour' is the wordplay.
'king' becomes 'r' (r is abbreviation for rex).
'with' means one lot of letters go next to another.
'honour' becomes 'obe' (**).
'r'+'obe'='ROBE'
'producing' is the link.
(Other definitions for robe that I've seen before include "Gown or dress of office" , "Ceremonial garment, clothe" , "Loose or formal garment" , "Gown, rich dress" , "judge's garment" .)