Follow in a manner almost unseen (5)

I believe the answer is:

ensue

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'follow' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for ensue that I've seen before include "Occur afterwards" , "Befall" , "Cultivate plants/vegetables" , "Happen - to come later" , "Happen as consequence or afterward" .)

I've seen this clue in the Evening Standard.

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