Girl playing with soil (4)

I believe the answer is:

lois

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

'girl' is the definition.

'playing with soil' is the wordplay.
'soil' can be anagrammed to 'LOIS'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for lois that I've seen before include "Woman" , "- Lane, girlfriend of Superman" , "- Lane, Daily Planet reporter" , "Superman's girlfriend" , "-- Lane, 'Superman' character" .)

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