Crossword Genius

Old ladies eating good soft rock? (5)

Ross

I believe the answer is:

magma

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

'soft rock?' is the definition.
(I've seen this in another clue)

'old ladies eating good' is the wordplay.
'old ladies' becomes 'mama' (I can't justify this - if you can you should give a lot more credence to this answer).
'eating' indicates putting letters inside.
'good' becomes 'g' (abbreviation).
'mama' enclosing 'g' is 'MAGMA'.

Can you help me to learn more?

(Other definitions for magma that I've seen before include "Hot molten rock" , "Hot material" , "hot stuff" , "Molten rock in the earth's crust" , "Hot fluid rock" .)

I've seen this clue in The Sun.
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