What could be sharp, ensuring reshaping? (7,6)

I believe the answer is:

pruning shears

I'm a little stuck... Click here to teach me more about this clue!

'what could be sharp ensuring reshaping?' is the definition.
I can't judge whether this definition defines the answer.

'what could be sharp ensuring' is the wordplay.
'what could be' is an anagram indicator.
'sharp'+'ensuring'='sharpensuring'
'sharpensuring' is an anagram of 'PRUNING-SHEARS'.

Can you help me to learn more?

(Other definitions for pruning shears that I've seen before include "Garden tool" , "Garden trimmers" .)

I've seen this clue in The Everyman puzzle in The Observer.

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