Follow directions and prosecute (5)

I believe the answer is:

ensue

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'follow' is the definition.
(ensue can mean to follow or happen as a result)

I cannot understand how the rest of the clue works.

(Other definitions for ensue that I've seen before include "Turn out" , "Befall" , "Follow as a consequence" , "Come along afterwards" , "Arise" .)

I've seen this clue in The Mirror and The Globe and Mail.

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