Bird book, hardly concise (9)
I believe the answer is:
brambling
'bird' is the definition.
(brambling is a kind of bird)
'book hardly concise' is the wordplay.
'book' becomes 'b' (abbreviation for book).
'hardly concise' becomes 'rambling' (rambling can mean verbose as opposed to concise).
'b'+'rambling'='BRAMBLING'
(Other definitions for brambling that I've seen before include "berries" , "Type of finch" , "bird" .)