Work out where area of fear is (5)
I believe the answer is:
infer
'work out' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
(Other definitions for infer that I've seen before include "Conjecture" , "Insinuate" , "Deduce by reasoning" , "Take finer meaning from" , "Deduce, surmise" .)