Did she rob Heloise? (4)

I believe the answer is:

lois

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

'did she rob' is the definition.
I can't judge whether this definition defines the answer.

'heloise?' is the wordplay.
'LOIS' is hidden in amongst the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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