The youth some girl adores (3)
I believe the answer is:
lad
'the youth' is the definition.
(lad means a young man)
'some girl adores' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'LAD' can be found hidden inside 'girl adores'.
(Other definitions for lad that I've seen before include "Chap, fellow" , "Youngster" , "A young chap into ballads" , "Boy, young man" , "Stable employee" .)