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5D Clue - Native of Ireland's Capital
Answer - Dubliner.
This crosses with 19A clue Bleach.
Answer Chlorine
But both cannot be correct as the H in Chlorine occupies the same square as the E in Dubliner.
Anyine sorted this one out?

Peroxide?

Yes of course !! thanks for that. It fits in with everything else too.
Puzzle now complete!
cheers X