Honour a chap as king (6)
I believe the answer is:
oberon
'king' is the definition.
(I've seen this before)
'honour a chap' is the wordplay.
'honour' becomes 'OBE' (Order of the British Empire).
'a chap' becomes 'ron' (short for Ronald).
'obe'+'ron'='OBERON'
'as' acts as a link.
(Other definitions for oberon that I've seen before include "charming king" , "Shakespearean role" , "Shakespeare's fairy king" , "Spirited king" , "Play King" .)