The actual grid entry includes an additional letter N that is inserted somewhere in the above answer to form another legitimate word usually nothing to do with the clue.
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The letter pattern that I have for the grid entry is, _ N _ E _ D
Many thanks. I shall be kicking myself shortly, I think!
Thanks Shoota - the stupid thing was that I thought of unbend but could only see "unbed" rather than "Upend". Too tired last night when I tried to finish off.