Crossword Genius

Defender returning to the side? (4)

Ross

I believe the answer is:

back

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'defender' is the definition.
(left-backs and right-backs are football defenders)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for back that I've seen before include "Rear; spine" , "part of the body" , "Support; footballer" , "bet" , "ago" .)

I've seen this clue in The Sun.
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