Inveighing against - that's right; complaining of (7)

I believe the answer is:

railing

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'inveighing' is the definition.
('rail' can be a synonym of 'inveigh')

I don't understand the rest of the clue.

(Other definitions for railing that I've seen before include "barrier appears" , "border of park?" , "Metal barrier" , "Banter" , "Barrier, balustrade" .)

I've seen this clue in the Evening Standard.

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