The same liberal convenience in stone structures (7)

I believe the answer is:

dolmens

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'stone structures' is the definition.
'dolmens' can be an answer for 'structures' (dolmen is a kind of structure). I'm not certain of the 'stone' bit.

'the same liberal convenience' is the wordplay.
'the same' becomes 'do' (abbreviation for ditto).
'liberal' becomes 'l' (abbreviation).
'convenience' becomes 'men's' (men's is a kind of convenience).
'do'+'l'+'mens'='DOLMENS'

'in' acts as a link.

Can you help me to learn more?

(Another definition for dolmens that I've seen is " gravestones".)

I've seen this clue in the Sydney Morning Herald.

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