Choose the best tool to open lock (4)

I believe the answer is:

pick

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'choose' is the definition.
(I know that pick is a more specific form of choose)

I cannot understand how the remainder of the clue works.

(Other definitions for pick that I've seen before include "flower" , "Hero of a Dickens novel" , "Cream" , "Pluck" , "tool - it breaks" .)

I've seen this clue in The Independent.

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