How you might describe mummy? Looking good for her age!
I believe the answer is:
well-preserved
'how you might describe mummy? looking' is the definition.
I can't tell whether this definition defines the answer.
'good for her age' is the wordplay.
I cannot quite see how this works, but
'good' could be 'well' ('well' can be a synonym of 'good') and 'well' is found within the answer.
The remaining letters 'preserved' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for well-preserved that I've seen before include "In good condition for its age" , "Continuing to appear youthful" , "Continuing to look good" , "Looking good for one's age" , "Looking youthful" .)