It may need clipping again, left wild (6)
I believe the answer is:
agnail
'it may need clipping' is the definition.
(term for a hangnail)
'again left wild' is the wordplay.
'left' becomes 'l' (common abbreviation).
'wild' is an anagram indicator.
'again'+'l'='againl'
'againl' is an anagram of 'AGNAIL'.
(Other definitions for agnail that I've seen before include "It may cause irritation to finger" , "tear on index?" , "Torn skin" .)