Stone structure puzzling old people (6)

I believe the answer is:

dolmen

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'stone structure' is the definition.
'dolmen' can be an answer for 'structure' (dolmen is a kind of structure). I am unsure of the 'stone' bit.

'puzzling old people' is the wordplay.
'puzzling' indicates anagramming the letters.
'people' becomes 'men' (men are people).
'old' is an anagram of 'dol'.
'dol'+'men'='DOLMEN'

Can you help me to learn more?

(Other definitions for dolmen that I've seen before include "ancient monument" , "Ancient tomb for old men" , "Prehistoric megalithic tomb" , "Type of megalithic tomb" .)

I've seen this clue in The Times.

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