Aimless, aimless girl? (7)

I believe the answer is:

melissa

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

'aimless girl?' is the definition.
(I've seen this in another clue)

'aimless' is the wordplay.
'aimless' anagrams to 'MELISSA'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for melissa that I've seen before include "Female" , "Girl's name meaning "bee"" , "woman" .)

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