Running in fear (12)
I believe the answer is:
apprehension
I believe this is a double definition.
'running in' is the first definition.
(thesaurus)
'fear' is the second definition.
(I know that apprehension is a type of fear)
(Other definitions for apprehension that I've seen before include "Fearful anticipation" , "Understanding; anxiety" , "The catching" , "Fear" , "Arrest -- dread" .)