By making a hamper vegetarian (3)

I believe the answer is:

per

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

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

'a hamper vegetarian' is the wordplay.
'PER' is hidden within the letters.
But, I'm not sure how this is indicated.

'making' is the link.

Can you help me to learn more?

(Other definitions for per that I've seen before include "According to" , "Preposition indicating by means of" , "Preposition meaning for each" , "For each or every" .)

I've seen this clue in the Evening Standard.

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