Splendid tomb of mother lined with gold only (9)

I believe the answer is:

mausoleum

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'splendid tomb' is the definition.
'mausoleum' can be an answer for 'tomb' (mausoleum is a kind of tomb). I am not sure about the 'splendid' bit.

'mother lined with gold only' is the wordplay.
'mother' becomes 'mum' (informal term for mother).
'lined with' indicates putting letters inside (as in being filled or lined with something).
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'only' becomes 'sole' (synonyms).
'au'+'sole'='ausole'
'mum' placed around 'ausole' is 'MAUSOLEUM'.

'of' is the link.

Can you help me to learn more?

(Other definitions for mausoleum that I've seen before include "Wonder of World tomb" , "Magnificent tomb or monument" , "One may lie impressively in this" , "gloomy site" , "place such as Taj Mahal" .)

I've seen this clue in The Times.

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