Distant sections support black hair (4-6)

I believe the answer is:

back-blocks

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'distant sections' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'support black hair' is the wordplay.
'support' becomes 'back' (backing is a kind of supporting).
'black' becomes 'b' (as in pencil classifications).
'hair' becomes 'locks' (I've seen this before).
'back'+'b'+'locks'='BACK-BLOCKS'

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

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