Scarecrow's fear (4)
I believe the answer is:
fire
'scarecrow's fear' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for fire that I've seen before include "Blaze - discharge" , "Shoot; sack" , "Flames; passion" , "cut" , "Sack; conflagration" .)