Put on edge (5)
I believe the answer is:
honed
'put on edge' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives can sometimes mean the same thing.
'put on edge' is the wordplay.
'put' is an insertion indicator.
'edge' becomes 'hed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'on' going inside 'hed' is 'HONED'.
Can you help me to learn more?
(Other definitions for honed that I've seen before include "Refined" , "Perfected" , "Sharpened with a stone" .)