Crossword Genius

Where mum needs £50 to go shopping? (4)

Ross

I believe the answer is:

mall

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

'where mum needs ps50 to go shopping?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'where mum' is the wordplay.
I cannot really see how this works, but
'mum' could be 'ma' (ma can mean mother) and 'ma' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for mall that I've seen before include "Shopping facility" , "Sheltered walk or promenade" , "Traffic-free street" , "Shopping precinct" , "Glowing material in fire" .)

I've seen this clue in the Evening Standard.
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