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I say, Edward, that's sharp! (5)

Ross

I believe the answer is:

honed

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'sharp' is the definition.
(I've seen this in another clue)

'i say edward' is the wordplay.
'i say' becomes 'hon' (I can't explain this - if you can you should believe this answer much more).
'edward' becomes 'Ed' (short for Edward).
'hon'+'ed'='HONED'

'that's' is the link.

Can you help me to learn more?

(Other definitions for honed that I've seen before include "Perfected" , "Refined" , "Sharpened with a stone" .)

I've seen this clue in the Evening Standard.
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