Game bird that makes us shrink back with fear (5)
I believe the answer is:
quail
This clue is a triple definition!
'game' is the first definition.
(I know that quail is a type of phasianid)
'bird' is the second definition.
(quail is a kind of bird)
'that makes us' is a link.
'shrink back with fear' is the third definition.
(quail can mean to show fear)
(Other definitions for quail that I've seen before include "Cower before the game-bird?" , "recoil with fear" , "Flinch from small gamebird?" , "Game bird - cower" , "Show fear - of small game bird?" .)