King ordered fine blade (5)
I believe the answer is:
knife
'blade' is the definition.
(I know that Knife is a knife)
'king ordered fine' is the wordplay.
'king' becomes 'K' (chess abbreviation).
'ordered' indicates an anagram.
'fine' is an anagram of 'nife'.
'k'+'nife'='KNIFE'
(Other definitions for knife that I've seen before include "following Stanley perhaps" , "Cutting utensil" , "Silent killer" , "Dagger" , "Potential weapon" .)