In Skye, a glen, a majestic creature (5)
I believe the answer is:
eagle
'creature' is the definition.
(I know that eagle is a type of Bird of prey)
'in skye a glen a majestic' is the wordplay.
'in' indicates a hidden word.
'EAGLE' is hidden in the letters of 'skye a glen majestic'.
(Other definitions for eagle that I've seen before include "Bald, golden, bird" , "A glee-ful bird?" , "Large birds of prey." , "Avian symbol of power" , "ten-dollar coin" .)