A rash girl? (5)

I believe the answer is:

sarah

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

'girl?' is the definition.

'a rash' is the wordplay.
'a rash' anagrams to 'SARAH'.
But, I am not clear 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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