Small hound in book, shown by bird of prey (6)
I believe the answer is:
beagle
'small hound' is the definition.
(I've seen this before)
'book shown by bird of prey' is the wordplay.
'book' becomes 'b'.
'shown by' says to put letters next to each other.
'bird of prey' becomes 'eagle' (eagle is a kind of bird of prey).
'b'+'eagle'='BEAGLE'
'in' acts as a link.
(Other definitions for beagle that I've seen before include "HMS - was Darwin's ship; hunting dog" , "Small, sturdy breed of hound" , "Hound dog" , "Darwin voyaged in this ship" , "Breed of dog in a glebe" .)