Child’s turn? Yes, go freely (9)
I believe the answer is:
youngster
'child's' is the definition.
(synonyms)
'turn? yes go freely' is the wordplay.
'freely' is an anagram indicator.
'turn'+'yes'+'go'='turnyesgo'
'turnyesgo' is an anagram of 'YOUNGSTER'.
(Other definitions for youngster that I've seen before include "Adolescent" , "Rug rat in New York" , "One not fully mature" , "Person of tender years" , "Child, minor" .)