Part of speech in casino unabridged (4)
I believe the answer is:
noun
'part of speech' is the definition.
(noun is a part of speech)
'in casino unabridged' is the wordplay.
'in' indicates a hidden word.
'NOUN' is hidden in the letters of 'casino unabridged'.
(Other definitions for noun that I've seen before include "Content word for person, place, thing etc" , "Category of word" , "Word used as a name for something or person" , "Word identifying people, things, etc" , "Word that refers to a person, place or thing" .)