Get instruction to sheepdog (4,2)

I believe the answer is:

come by

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'get' is the definition.
(coming by is a kind of getting)

I cannot understand how the remainder of the clue works.

(Other definitions for come by that I've seen before include "Encounter" , "Manage to acquire" , "Obtain accidentally - visit informally" , "Manage to obtain" , "Find" .)

I've seen this clue in The Independent.

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