Is afraid of disturbing adders (6)
I believe the answer is:
dreads
'is afraid of' is the definition.
(I've seen this in another clue)
'disturbing adders' is the wordplay.
'disturbing' indicates anagramming the letters (I've seen this in other clues).
'adders' is an anagram of 'DREADS'.
(Other definitions for dreads that I've seen before include "Worries about" , "Is in great fear of" , "Looks ahead with apprehension" , "Strongly fears" , "Is terrified" .)