Getting in a wild pet is useless (5)
I believe the answer is:
inept
'useless' is the definition.
(I've seen this before)
'getting in a wild pet' is the wordplay.
'getting' becomes 'in' (I can't explain this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'a wild' indicates anagramming the letters.
'pet' with letters rearranged gives 'ept'.
'in' going inside 'ept' is 'INEPT'.
'is' is the link.
Can you help me to learn more?
(Other definitions for inept that I've seen before include "Wanting" , "Unsuitable, clumsy" , "Incompetent or gauche" , "Hopeless; bungling" , "Unskilful, awkward" .)