Crossword Genius

Defender who'll retreat? (4)

Ross

I believe the answer is:

back

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This could be a double definition.

'defender' is the first definition.
(I've seen this before)

'who'll retreat?' is the second definition.
'back' can be an answer for 'retreat?' (thesaurus). I am not sure about the 'who'll' bit.

Can you help me to learn more?

(Other definitions for back that I've seen before include "defensive player" , "Support; in return" , "Give support to; player" , "Support; footballer" , "Rear surface of the body" .)

I've seen this clue in the Evening Standard.
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