Follow in a manner almost unseen (5)
I believe the answer is:
ensue
'follow' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(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" .)