Crossword Genius

Make vague promo for jacket with no back (4)


I believe the answer is:


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'make vague' is the definition.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for blur that I've seen before include "Hazy patch" , "fade" , "Obscure; smudge" , "Smear, make indistinct" , "Group - thing not clearly seen" .)

I've seen this clue in The Guardian.
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