Guarantee bit of pork trimmed by butcher showing skill with blade (9)

I believe the answer is:
swordplay
'guarantee bit of pork' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'trimmed by butcher showing skill with blade' is the wordplay.
'trimmed by butcher showing skill' becomes 'play' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'with' says to put letters next to each other.
'blade' becomes 'sword ' (synonyms).
'play' after 'sword' is 'SWORDPLAY'.
Can you help me to learn more?
(Other definitions for swordplay that I've seen before include "Maybe foil usage" , "Brand management" , "Zorro's skill" , "Fencing skill" , "Fencer's skill" .)
