Youth taken in by devil is terribly misguided (3-7)
I believe the answer is:
ill-advised
'misguided' is the definition.
(ill-advised means misguided or unwise)
'youth taken in by devil is terribly' is the wordplay.
I cannot really see how this works, but
'youth' could be 'lad' (lad means a young man) and 'lad' is located in the answer.
'is' is found in the answer.
an anagram of 'devil' is 'ilved' which is within the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ill-advised that I've seen before include "Unwise" , "Not prudent" , "Rash" , "Imprudent" .)