Small falcon (7)
'small falcon' is the definition.
(type of falcon)
This is all the clue.
(Other definitions for kestrel that I've seen before include "Small species of falcon" , "Predator" , "High-flyer" , "Falcon that hovers" , "Les, trek around the bird" .)
'small falcon' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for merlin that I've seen before include "Hawk-like magician of Camelot" , "Camelot's magician or kind of falcon" , "BBC series" , "King Arthur's magician" , "Arthur's adviser" .)