Threaten with fury following tip (8)
I believe the answer is:
endanger
'threaten' is the definition.
('endanger' can be a synonym of 'threaten')
'fury following tip' is the wordplay.
'fury' becomes 'anger' (I've seen this before).
'following' means one lot of letters go next to another.
'tip' becomes 'end'.
'anger' put after 'end' is 'ENDANGER'.
'with' is the link.
(Other definitions for endanger that I've seen before include "Put someone at risk" , "Dan Green (anag.)" , "Place into peril, jeopardise" , "compromise" , "Jeopardize" .)