Faced stalker from time to time, displaying nerve (6)
I believe the answer is:
mettle
'nerve' is the definition.
(I know that nerve can be written as mettle)
'faced stalker from time to time' is the wordplay.
'faced' becomes 'met' (I've seen this in other clues).
'from time to time' indicates alternate letters (letters removed on a regular basis).
The alternating letters of 'stalker' are 'tle'.
'met'+'tle'='METTLE'
'displaying' is the link.
(Other definitions for mettle that I've seen before include "Inherent character - courage" , "Courage sounds like iron, for instance" , "Temperament; courage" , "Spirit, resilience" , "boldness" .)