Crossword Genius

End piece that protects the rear when flying (4,3)

Ross

I believe the answer is:

tail gun

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'protects the rear when flying' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'end piece' is the wordplay.
'end' becomes 'tail' (tail is a kind of end).
'piece' becomes 'gun' (slang term for a gun).
'tail'+'gun'='TAIL GUN'

'that' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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