Creature with young heading away enthrals everyone (7)
I believe the answer is:
wallaby
'creature' is the definition.
(thesaurus)
'young heading away enthrals everyone' is the wordplay.
'young heading' becomes 'wa' (I can't explain this - if you can you should give a lot more credence to this answer).
'away' becomes 'by' (synonyms).
'enthrals' indicates putting letters inside.
'everyone' becomes 'all' (all people).
'wa'+'by'='waby'
'waby' enclosing 'all' is 'WALLABY'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for wallaby that I've seen before include "Native antipodean marsupial" , "Small marsupial" , "Jumping marsupial" , "rugby international" , "One like small kangaroo" .)