Being untidily coiled will do no harm (6)
I believe the answer is:
docile
'will do no harm' is the definition.
I can't judge whether this definition defines the answer.
'being untidily coiled' is the wordplay.
'coiled' can be anagrammed to 'DOCILE'.
Though, I am not clear how the anagram is indicated.
Can you help me to learn more?
(Other definitions for docile that I've seen before include "Gentle and biddable" , "easy to manage" , "'Submissive, easy to control (6)'" , "Willing to be taught or led" , "Gentle and teachable" .)