One of The Stones, still standing in central Germany touring Rhine? (6)

I believe the answer is:

menhir

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'one of the stones still standing' is the definition.
I can't tell whether this definition defines the answer.

'central germany touring rhine?' is the wordplay.
'central' says to take the centre.
'touring' is an anagram indicator (touring can mean moving around).
The middle of 'germany' is 'm'.
'rhine' is an anagram of 'enhir'.
'm'+'enhir'='MENHIR'

'in' is the link.

Can you help me to learn more?

(Other definitions for menhir that I've seen before include "5 Down" , "Standing stone" , "Ancient upright stone" .)

I've seen this clue in The Irish Times.

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