Crossword Genius

Prime movement against obligations being non-receptive (10)

Ross

I believe the answer is:

impervious

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'non-receptive' is the definition.
I can't judge whether this defines the answer.

'prime movement against obligations being' is the wordplay.
'movement' is an anagram indicator (letters move around).
'against' becomes 'v' (abbreviation for 'versus').
'obligations being' becomes 'ious' (I can't justify this - if you can you should give a lot more credence to this answer).
'prime' with letters rearranged gives 'imper'.
'imper'+'v'+'ious'='IMPERVIOUS'

Can you help me to learn more?

(Another definition for impervious that I've seen is " impossible to pass".)

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