Communal divestment mars unit development (8)

I believe the answer is:

naturism

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'communal divestment' is the definition.
The definition suggests a singular noun which matches the answer.

'mars unit development' is the wordplay.
'development' is an anagram indicator.
'mars'+'unit'='marsunit'
'marsunit' anagrammed gives 'NATURISM'.

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(Other definitions for naturism that I've seen before include "Nudism" , "letting it all hang out!" , "Practice of going around naked" , "outdoor pursuit" , "Pursuit of nudity" .)

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

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