Threaten close friend hiding papers (10)
I believe the answer is:
intimidate
'threaten' is the definition.
(I've seen this before)
'close friend hiding papers' is the wordplay.
'close friend' becomes 'intimate' (I've seen this before).
'hiding' indicates putting letters inside.
'papers' becomes 'id' (identification papers).
'intimate' going around 'id' is 'INTIMIDATE'.
(Other definitions for intimidate that I've seen before include "Cow" , "Frighten" , "Bully" , "Threaten" , "Scare" .)