Its a blunder, either way you look at it (4)

I believe the answer is:

boob

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the rest of the clue.

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(Other definitions for boob that I've seen before include "Mistake; breast (sl.)" , "Blunder (colloq.)" , "Slip" , "Error" , "Embarrassing mistake" .)

I've seen this clue in The Irish Independent.

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