17 across
Great-niece
unfortunately
lacking
the
focus
of
Blake
Lively
(9)
Great-niece unfortunately lacking the focus of Blake Lively (9)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Look at Lively at the end — that's your definition. Now take the letters of great-niece, drop the A (the centre letter of Blake, which is what "focus of Blake" points you to), and then anagram what's left — "unfortunately" is your anagram signal — to get your answer.