Youthful (5)
'youthful' is the definition.
(I know that youthful can be written as young)
This is the entire clue.
(Other definitions for young that I've seen before include "In early life" , "without experience" , "Fry" , "Born recently" , "Of tender years" .)
(Another definition for unwrinkled that I've seen is " Smooth".)
'youthful' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for boyish that I've seen before include "Juvenile" , "how immature youth is" , "Like young male" , "Youthful" , "Like a young lad" .)