I am England's new star (7,3)
I believe the answer is:
'star' is the definition.
(I've seen this before)
'i am england's new' is the wordplay.
'new' is an anagram indicator.
'iamengland' anagrammed gives 'LEADING MAN'.
(Other definitions for leading man that I've seen before include "Principal actor" , "Chief actor" , "megastar?" , "Star" , "top fellow on stage" .)