Some go and decide to change efficient structure (8,4)

I believe the answer is:

geodesic dome

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'efficient structure' is the definition.
The definition suggests a singular noun which matches the answer.

'some go and decide to change' is the wordplay.
'and' is a charade indicator (letters next to each other).
'to change' is an anagram indicator.
'some'+'go'+'decide'='somegodecide'
'somegodecide' with letters rearranged gives 'GEODESIC DOME'.

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I've seen this clue in The Times.

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