Is she able to heal? (4)

I believe the answer is:

leah

I'm a little stuck... Click here to teach me more about this clue!

'is she' is the definition.

'able to heal?' is the wordplay.
'heal' can be anagrammed to 'LEAH'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for leah that I've seen before include "Jacob's first wife (Bible)" , "Jacob's first wife (Gen. 29)" , "She married Jacob" , "Jacobs first wife (Gen.29)" , "Hale (anag) - wife of Jacob" .)

I've seen this clue in the Evening Standard.

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