Mostly angry over Poles securing good gifts of the Church? (7)

I believe the answer is:

livings

I'm a little stuck... Click here to teach me more about this clue!

'gifts of the church?' is the definition.
(living can mean a paid role in the clergy)

'mostly angry over poles securing good' is the wordplay.
'mostly angry over' becomes 'livi' (I can't explain this - if you can you should believe this answer much more).
'poles' becomes 'NS' (North and South poles).
'securing' is an insertion indicator.
'good' becomes 'g' (abbreviation).
'ns' going around 'g' is 'ngs'.
'livi'+'ngs'='LIVINGS'

Can you help me to learn more?

I've seen this clue in The Independent.

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