Crossword Genius

Backs raise before send-off (4,4)

Ross

I believe the answer is:

rear ends

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'backs' is the definition.
The definition and answer can be both body parts as well as being plural nouns.
Perhaps there's a link between them I don't understand?

'raise before send-off' is the wordplay.
'raise' becomes 'rear' ('rear' can be a synonym of 'raise'**).
'before' is a charade indicator (letters next to each other).
'off' indicates an anagram.
'send' anagrammed gives 'ends'.
'rear'+'ends'='REAR ENDS'

Can you help me to learn more?

(Another definition for rear ends that I've seen is " Runs into".)

I've seen this clue in The Guardian.
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