Crossword Genius

Film electrician's outright blunder (5)

Ross

I believe the answer is:

gaffe

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for gaffe that I've seen before include "embarrassing error" , "Boob" , "Something wrong" , "indiscreet remark" , "slip" .)

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