Outcast's fathers' back-hair is within (7)

I believe the answer is:

pariahs

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'outcast's fathers' back-hair is within' is the definition.
I can't judge whether this definition defines the answer.

'fathers' back-hair is within' is the wordplay.
'fathers'' becomes 'pas'' (pa is a kind of father).
'back' says the letters should be written in reverse.
'is within' is an insertion indicator.
'hair' written backwards gives 'riah'.
'pas' enclosing 'riah' is 'PARIAHS'.

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(Other definitions for pariahs that I've seen before include "Social outcasts" , "People one wouldn't associate with" .)

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

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