Wrong point! Iron in Irish group? (4,4)

I believe the answer is:

sinn fein

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'irish group?' is the definition.
The definition suggests a singular noun which matches the answer.

'wrong point iron in' is the wordplay.
'wrong' becomes 'sin' (I've seen this before).
'point' becomes 'n' (N is an example).
'iron' becomes 'Fe' (Fe is the chemical symbol for iron).
'sin'+'n'+'fe'+'in'='SINN FEIN'

Can you help me to learn more?

(Other definitions for sinn fein that I've seen before include "Irish political party" , "Irish political movement" , "Fine inns (anag.)" , "Gerry Adams's party" , "GerryAdams's political party" .)

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

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