Colony resident has a book (3)
I believe the answer is:
ant
'colony resident' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?
'a book' is the wordplay.
'book' becomes 'NT' (New Testament).
'a'+'nt'='ANT'
'has' is the link.
Can you help me to learn more?
(Other definitions for ant that I've seen before include "Dec's long-time partner" , "Worker on the hill" , "that may be a soldier" , "Small busy insect" , "Member of colony" .)