Crossword Genius

With which to prune vines, possibly, at the King's Head (6)

Ross

I believe the answer is:

knives

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'with which to prune' is the definition.
I can't tell whether this definition defines the answer.

'vines possibly at the king's head' is the wordplay.
'possibly' indicates anagramming the letters.
'at' means one lot of letters go next to another (I've seen this in other clues).
'head' indicates taking the first letters.
The initial letter of 'kings' is 'k'.
'vines' is an anagram of 'nives'.
'nives' after 'k' is 'KNIVES'.

Can you help me to learn more?

(Other definitions for knives that I've seen before include "Cutting instruments" , "Cutting tools" , "Daggers" , "Weapons" , "Cutting implements" .)

I've seen this clue in the Evening Standard.
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