Young head-turner? (5)
I believe the answer is:
owlet
'young head-turner?' is the definition.
(owls can rotate their heads a long way round)
This is the entire clue.
(Other definitions for owlet that I've seen before include "Young nocturnal flier" , "Junior member of parliament" , "Small bird of prey from Africa and Asia" , "Wise young" , "Young hooter" .)