Wild animals alone with pets, worryingly (9)
I believe the answer is:
antelopes
'wild animals' is the definition.
(I've seen this before)
'alone with pets worryingly' is the wordplay.
'with' is a charade indicator (letters next to each other).
'worryingly' indicates an anagram (letters are disturbed or worried).
'alone' put after 'pets' is 'petsalone'.
'petsalone' anagrammed gives 'ANTELOPES'.
(Other definitions for antelopes that I've seen before include "Gazelles, impalas etc" , "Springboks, say" , "Wild animals" .)