Coroner is worried about hotel's animal (10)
I believe the answer is:
rhinoceros
'animal' is the definition.
(thesaurus)
'coroner is worried about hotel's' is the wordplay.
'worried' is an anagram indicator.
'about' indicates putting letters inside.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'coroner'+'is'='coroneris'
'coroneris' is an anagram of 'rinoceros'.
'rinoceros' enclosing 'h' is 'RHINOCEROS'.
(Other definitions for rhinoceros that I've seen before include "Ionesco's work" , "Big game" , "Large, thick-skinned ungulate" , "Horned mammal" , "Large horned animal" .)