Fears greatly (6)
I believe the answer is:
dreads
'fears greatly' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for dreads that I've seen before include "Anticipates with horror" , "Is terrified" , "Sadder (anag)" , "Is in great fear of" , "Greatly fears, is most apprehensive of" .)