Putting a point on a spear is a blunder (5)

I believe the answer is:

gaffe

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'a blunder' is the definition.
(I know that gaffe is a type of blunder)

I don't understand the remainder of the clue.

(Other definitions for gaffe that I've seen before include "Embarrassing blunder" , "Remark one wishes unmade" , "Boob" , "Brick (that's dropped)" , "indiscreet remark" .)

I've seen this clue in The Globe and Mail.

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