Mum uses sources in places displaying objects of lasting interest (7)
I believe the answer is:
'places displaying objects of lasting interest' is the definition.
I can't judge whether this defines the answer.
'mum uses sources' is the wordplay.
'sources' indicates anagramming the letters (I've seen 'source of' mean this).
'mumuses' anagrammed gives 'MUSEUMS'.
'in' is the link.
Can you help me to learn more?
(Other definitions for museums that I've seen before include "Places like the V&A" , "Sue's mum (anag.)" , "Louvre and V&A?" .)