A rash girl? (5)

I believe the answer is:

sarah

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'girl?' is the definition.

'a rash' is the wordplay.
'a rash' can be anagrammed to 'SARAH'.
But, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for sarah that I've seen before include "Wife of Abraham" , "Abraham's wife (OT)" , "Girl's name" , "Woman" , "Abraham's wife in the Old Testament" .)

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